diff --git a/library/libsds.nim b/library/libsds.nim
index e3e5d28..53d2a4e 100644
--- a/library/libsds.nim
+++ b/library/libsds.nim
@@ -233,6 +233,11 @@ proc SdsWrapOutgoingMessage(
     callback(RET_ERR, unsafeAddr msg[0], cast[csize_t](len(msg)), userData)
     return RET_ERR
 
+  if channelId != nil and $channelId == "":
+    let msg = "libsds error: " & "channel ID is empty string"
+    callback(RET_ERR, unsafeAddr msg[0], cast[csize_t](len(msg)), userData)
+    return RET_ERR
+
   handleRequest(
     ctx,
     RequestType.MESSAGE,
@@ -289,6 +294,11 @@ proc SdsMarkDependenciesMet(
     callback(RET_ERR, unsafeAddr msg[0], cast[csize_t](len(msg)), userData)
     return RET_ERR
 
+  if channelId != nil and $channelId == "":
+    let msg = "libsds error: " & "channel ID is empty string"
+    callback(RET_ERR, unsafeAddr msg[0], cast[csize_t](len(msg)), userData)
+    return RET_ERR
+
   handleRequest(
     ctx,
     RequestType.DEPENDENCIES,