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-rw-r--r--module/system/vm/disassembler.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/module/system/vm/disassembler.scm b/module/system/vm/disassembler.scm
index 497aa58fa..577124a7e 100644
--- a/module/system/vm/disassembler.scm
+++ b/module/system/vm/disassembler.scm
@@ -335,7 +335,7 @@ address of that offset."
((< pc addr) (lp sources))
((= pc addr)
(format #f "~a:~a:~a"
- (source-file source)
+ (or (source-file source) "(unknown file)")
(source-line-for-user source)
(source-column source)))
(else #f)))))))