diff --git a/src/userfunc.c b/src/userfunc.c
index 197e2e0..8d1df0c 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -4032,12 +4032,12 @@
     funccall_T		*fc;
     funccal_entry_T	*entry;
 
-    for (fc = current_funccal; fc != NULL; fc = fc->caller)
+    for (fc = current_funccal; !abort && fc != NULL; fc = fc->caller)
 	abort = abort || set_ref_in_funccal(fc, copyID);
 
     // Also go through the funccal_stack.
-    for (entry = funccal_stack; entry != NULL; entry = entry->next)
-	for (fc = entry->top_funccal; fc != NULL; fc = fc->caller)
+    for (entry = funccal_stack; !abort && entry != NULL; entry = entry->next)
+	for (fc = entry->top_funccal; !abort && fc != NULL; fc = fc->caller)
 	    abort = abort || set_ref_in_funccal(fc, copyID);
 
     return abort;