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-rw-r--r--eval_error.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/eval_error.c b/eval_error.c
index fa9fa8cdab..e8a1691036 100644
--- a/eval_error.c
+++ b/eval_error.c
@@ -32,7 +32,7 @@ error_pos_str(void)
int sourceline;
VALUE sourcefile = rb_source_location(&sourceline);
- if (sourcefile) {
+ if (!NIL_P(sourcefile)) {
ID caller_name;
if (sourceline == 0) {
return rb_sprintf("%"PRIsVALUE": ", sourcefile);