diff --git a/src/de/inetsoftware/jwebassembly/module/FunctionManager.java b/src/de/inetsoftware/jwebassembly/module/FunctionManager.java
index 6ac7e4e..c5e2257 100644
--- a/src/de/inetsoftware/jwebassembly/module/FunctionManager.java
+++ b/src/de/inetsoftware/jwebassembly/module/FunctionManager.java
@@ -201,6 +201,14 @@ class FunctionManager {
         return state.alias == null ? name : state.alias;
     }
 
+    /**
+     * If the function manager is finish
+     * @return the finish flag
+     */
+    boolean isFinish() {
+        return isFinish;
+    }
+
     /**
      * Mark the a function as scanned in the prepare phase. This should only occur with needed functions.
      * 
diff --git a/src/de/inetsoftware/jwebassembly/module/UnsafeManager.java b/src/de/inetsoftware/jwebassembly/module/UnsafeManager.java
index 81e1213..bb3537e 100644
--- a/src/de/inetsoftware/jwebassembly/module/UnsafeManager.java
+++ b/src/de/inetsoftware/jwebassembly/module/UnsafeManager.java
@@ -472,6 +472,9 @@ class UnsafeManager {
                                     }
                                 }
                                 if( state == null ) {
+                                    if( functions.isFinish() ) {
+                                        throw new RuntimeException( name.signatureName );
+                                    }
                                     // we are in the scan phase. The static code was not scanned yet.
                                     return "";
                                 }