diff --git a/rln-delay-simulations/analyze.py b/rln-delay-simulations/analyze.py
index 6f240fb..b05786e 100644
--- a/rln-delay-simulations/analyze.py
+++ b/rln-delay-simulations/analyze.py
@@ -9,11 +9,11 @@ latencies = []
 with open(file, "r") as file:
     for line in file.readlines():
         if field in line:
-            seq = int(line.strip().split("seq=")[1].split(" ")[0])
             # first message bias the latency due to tcp flow control
-            if seq in [0]:
-                continue
-            seq = line.strip().split("seq=")[1].split(" ")[0]
+            if "seq=" in line:
+                seq = int(line.strip().split("seq=")[1].split(" ")[0])
+                if seq in [0]:
+                    continue
             x = line.strip().split(field)[1].split(" ")[0]
             latencies.append(int(x))