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-rw-r--r--ext/sdbm/init.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/sdbm/init.c b/ext/sdbm/init.c
index 0f9ae1dbff..ed39769e7a 100644
--- a/ext/sdbm/init.c
+++ b/ext/sdbm/init.c
@@ -366,6 +366,7 @@ fsdbm_delete_if(obj)
for (i = 0; i < RARRAY(ary)->len; i++) {
keystr = RARRAY(ary)->ptr[i];
+ StringValue(keystr);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
if (sdbm_delete(dbm, key)) {