diff --git a/ethereumj-core/src/main/java/org/ethereum/vm/OpCode.java b/ethereumj-core/src/main/java/org/ethereum/vm/OpCode.java
index 44ac46b6..e4aae830 100644
--- a/ethereumj-core/src/main/java/org/ethereum/vm/OpCode.java
+++ b/ethereumj-core/src/main/java/org/ethereum/vm/OpCode.java
@@ -328,6 +328,11 @@ public enum OpCode {
         return opcode;
     }
     
+    /**
+     * Returns the mininum amount of items required on the stack for this operation
+     * 
+     * @return minimum amount of expected items on the stack
+     */
     public int require() {
     	return require;
     }
diff --git a/ethereumj-core/src/main/java/org/ethereum/vm/ProgramInvokeFactory.java b/ethereumj-core/src/main/java/org/ethereum/vm/ProgramInvokeFactory.java
index f957b251..60999a0c 100644
--- a/ethereumj-core/src/main/java/org/ethereum/vm/ProgramInvokeFactory.java
+++ b/ethereumj-core/src/main/java/org/ethereum/vm/ProgramInvokeFactory.java
@@ -4,6 +4,7 @@ import org.ethereum.core.Block;
 import org.ethereum.core.Transaction;
 import org.ethereum.facade.Repository;
 import org.ethereum.manager.WorldManager;
+import org.ethereum.util.ByteUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.spongycastle.util.encoders.Hex;
@@ -36,7 +37,7 @@ public class ProgramInvokeFactory {
 
         /***         ADDRESS op       ***/
         // YP: Get address of currently executing account.
-        byte[] address  =  (tx.isContractCreation())? tx.getContractAddress(): tx.getReceiveAddress();
+        byte[] address  =  tx.isContractCreation() ? tx.getContractAddress(): tx.getReceiveAddress();
 
         /***         ORIGIN op       ***/
         // YP: This is the sender of original transaction; it is never a contract.
@@ -61,8 +62,7 @@ public class ProgramInvokeFactory {
         /***     CALLDATALOAD  op   ***/
         /***     CALLDATACOPY  op   ***/
         /***     CALLDATASIZE  op   ***/
-        byte[] data = tx.getData();
-        if (data == null) data = new byte[]{};
+        byte[] data = tx.getData() == null ? ByteUtil.EMPTY_BYTE_ARRAY : tx.getData();
 
         /***    PREVHASH  op  ***/
         byte[] lastHash = lastBlock.getHash();
@@ -183,12 +183,13 @@ public class ProgramInvokeFactory {
                     gasLimit.longValue());
         }
         
-    	if(program.invokeData.getCallDeep() >= MAX_CREATE_CALL_DEPTH) {
-    		throw program.new OutOfGasException();
-    	}
+        int newCallDepth = program.invokeData.getCallDeep() + 1;
+        if (newCallDepth >= MAX_CREATE_CALL_DEPTH) {
+        	throw program.new OutOfGasException();
+        }
 
         return new ProgramInvokeImpl(address, origin, caller, balance, gasPrice, gas, callValue,
                 data, lastHash, coinbase, timestamp, number, difficulty, gasLimit,
-                repository, program.invokeData.getCallDeep()+1);
+                repository, newCallDepth);
     }
 }
diff --git a/ethereumj-core/src/main/java/org/ethereum/vm/VM.java b/ethereumj-core/src/main/java/org/ethereum/vm/VM.java
index 790d7f00..66a39fd6 100644
--- a/ethereumj-core/src/main/java/org/ethereum/vm/VM.java
+++ b/ethereumj-core/src/main/java/org/ethereum/vm/VM.java
@@ -892,7 +892,6 @@ public class VM {
                     program.stop();
                 }	break;
                 case SUICIDE:{
-                	program.stackRequire(1);
                 	DataWord address =  program.stackPop();
                     program.suicide(address);
                     
diff --git a/ethereumj-core/src/test/resources/jsontestsuite/vmtests/vmSystemOperationsTest.json b/ethereumj-core/src/test/resources/jsontestsuite/vmtests/vmSystemOperationsTest.json
index 920cb233..a2dd1d1c 100644
--- a/ethereumj-core/src/test/resources/jsontestsuite/vmtests/vmSystemOperationsTest.json
+++ b/ethereumj-core/src/test/resources/jsontestsuite/vmtests/vmSystemOperationsTest.json
@@ -127,6 +127,134 @@
             }
         }
     },
+    "ABAcalls2" : {
+        "callcreates" : [
+            {
+                "data" : "0x",
+                "destination" : "945304eb96065b2a98b57a48a06ae28d285a71b5",
+                "gasLimit" : "9999999998768",
+                "value" : "1"
+            }
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x6001600056016000576000600060006000600173945304eb96065b2a98b57a48a06ae28d285a71b56103e85c03f1",
+            "data" : "0x",
+            "gas" : "10000000000000",
+            "gasPrice" : "100000000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "100000"
+        },
+        "gas" : "1003475",
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "999999999999999488",
+                "code" : "0x6001600056016000576000600060006000600173945304eb96065b2a98b57a48a06ae28d285a71b56103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x01"
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "512",
+                "code" : "0x60016000560160005760006000600060006000730f572e5295c57f15886f9b263e2f6d2d6c7b5ec66103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x0200"
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x6001600056016000576000600060006000600173945304eb96065b2a98b57a48a06ae28d285a71b56103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "0",
+                "code" : "0x60016000560160005760006000600060006000730f572e5295c57f15886f9b263e2f6d2d6c7b5ec66103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
+    "ABAcalls3" : {
+        "callcreates" : [
+            {
+                "data" : "0x",
+                "destination" : "945304eb96065b2a98b57a48a06ae28d285a71b5",
+                "gasLimit" : "998768",
+                "value" : "1"
+            }
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x6001600056016000576000600060006000600173945304eb96065b2a98b57a48a06ae28d285a71b56103e85c03f1",
+            "data" : "0x",
+            "gas" : "1000000",
+            "gasPrice" : "100000000000000",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "100000"
+        },
+        "gas" : "864457",
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1024558",
+                "code" : "0x6001600056016000576000600060006000600173945304eb96065b2a98b57a48a06ae28d285a71b56103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x01"
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "442",
+                "code" : "0x60016000560160005760006000600060006000730f572e5295c57f15886f9b263e2f6d2d6c7b5ec66103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x01b9"
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "1025000",
+                "code" : "0x6001600056016000576000600060006000600173945304eb96065b2a98b57a48a06ae28d285a71b56103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "945304eb96065b2a98b57a48a06ae28d285a71b5" : {
+                "balance" : "0",
+                "code" : "0x60016000560160005760006000600060006000730f572e5295c57f15886f9b263e2f6d2d6c7b5ec66103e85c03f1",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
     "ABAcallsSuicide0" : {
         "callcreates" : [
             {
@@ -239,7 +367,7 @@
             }
         }
     },
-    "CallRecursiveBomb" : {
+    "CallRecursiveBomb0" : {
         "callcreates" : [
             {
                 "data" : "0x",
@@ -303,6 +431,156 @@
             }
         }
     },
+    "CallRecursiveBomb1" : {
+        "callcreates" : [
+            {
+                "data" : "0x",
+                "destination" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+                "gasLimit" : "364267",
+                "value" : "0"
+            }
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+            "data" : "0x",
+            "gas" : "364723",
+            "gasPrice" : "1",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "100000"
+        },
+        "gas" : "104246",
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "20000000",
+                "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x03fe",
+                    "0x01" : "0x01"
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "20000000",
+                "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
+    "CallRecursiveBomb2" : {
+        "callcreates" : [
+            {
+                "data" : "0x",
+                "destination" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+                "gasLimit" : "364268",
+                "value" : "0"
+            }
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+            "data" : "0x",
+            "gas" : "364724",
+            "gasPrice" : "1",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "100000"
+        },
+        "gas" : "104551",
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "20000000",
+                "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x03ff",
+                    "0x01" : "0x01"
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "20000000",
+                "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
+    "CallRecursiveBomb3" : {
+        "callcreates" : [
+            {
+                "data" : "0x",
+                "destination" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+                "gasLimit" : "999544",
+                "value" : "0"
+            }
+        ],
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "10000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : "1",
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "exec" : {
+            "address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+            "caller" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+            "data" : "0x",
+            "gas" : "1000000",
+            "gasPrice" : "1",
+            "origin" : "cd1722f3947def4cf144679da39c4c32bdc35681",
+            "value" : "100000"
+        },
+        "gas" : "104551",
+        "out" : "0x",
+        "post" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "20000000",
+                "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x03ff",
+                    "0x01" : "0x01"
+                }
+            }
+        },
+        "pre" : {
+            "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6" : {
+                "balance" : "20000000",
+                "code" : "0x600160005601600057600060006000600060003060e05c03f1600157",
+                "nonce" : "0",
+                "storage" : {
+                }
+            }
+        }
+    },
     "CallToNameRegistrator0" : {
         "callcreates" : [
             {