--- libgig/trunk/src/gig.cpp	2020/07/24 13:29:13	3798
+++ libgig/trunk/src/gig.cpp	2020/07/25 09:28:56	3799
@@ -5958,7 +5958,11 @@
         PianoReleaseMode = orig->PianoReleaseMode;
         DimensionKeyRange = orig->DimensionKeyRange;
         scriptPoolFileOffsets = orig->scriptPoolFileOffsets;
-        pScriptRefs = orig->pScriptRefs;
+        // deep copy of pScriptRefs required (to avoid undefined behaviour)
+        if (pScriptRefs) delete pScriptRefs;
+        pScriptRefs = new std::vector<_ScriptPooolRef>;
+        if (orig->pScriptRefs)
+            *pScriptRefs = *orig->pScriptRefs;
         scriptVars = orig->scriptVars;
         
         // free old midi rules