diff --git a/modules/core/src/main/java/org/apache/synapse/config/SynapseConfiguration.java b/modules/core/src/main/java/org/apache/synapse/config/SynapseConfiguration.java
index ace07c6109..3b3870a13f 100644
--- a/modules/core/src/main/java/org/apache/synapse/config/SynapseConfiguration.java
+++ b/modules/core/src/main/java/org/apache/synapse/config/SynapseConfiguration.java
@@ -494,7 +494,7 @@ public synchronized void validateSwaggerTable() {
         while (swaggerIterator.hasNext()) {
             String name = swaggerIterator.next();
             if (!apiTable.containsKey(name)) {
-                swaggerTable.remove(name);
+                swaggerIterator.remove();
             }
         }
     }