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-rw-r--r--compiler/sigmatch.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/sigmatch.nim b/compiler/sigmatch.nim
index b4d875981..a0de33ed5 100644
--- a/compiler/sigmatch.nim
+++ b/compiler/sigmatch.nim
@@ -246,7 +246,8 @@ proc sumGeneric(t: PType): int =
           result += sumGeneric(a)
       break
     of tyProc:
-      result += sumGeneric(t.returnType)
+      if t.returnType != nil:
+        result += sumGeneric(t.returnType)
       for _, a in t.paramTypes:
         result += sumGeneric(a)
       break