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-rw-r--r--lib/system/jssys.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/system/jssys.nim b/lib/system/jssys.nim
index 8be19e5b8..d7718e4f4 100644
--- a/lib/system/jssys.nim
+++ b/lib/system/jssys.nim
@@ -46,7 +46,7 @@ proc nimCharToStr(x: char): string {.compilerproc.} =
   result[0] = x
 
 proc isNimException(): bool {.asmNoStackFrame.} =
-  asm "return `lastJSError`.m_type;"
+  asm "return `lastJSError` && `lastJSError`.m_type;"
 
 proc getCurrentException*(): ref Exception {.compilerRtl, benign.} =
   if isNimException(): result = cast[ref Exception](lastJSError)