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-rw-r--r--src/afl-fuzz-run.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/afl-fuzz-run.c b/src/afl-fuzz-run.c
index 12352355..56c52c9b 100644
--- a/src/afl-fuzz-run.c
+++ b/src/afl-fuzz-run.c
@@ -680,7 +680,8 @@ void sync_fuzzers(char** argv) {
 u8 trim_case(char** argv, struct queue_entry* q, u8* in_buf) {
 
   /* Custom mutator trimmer */
-  if (mutator->afl_custom_trim) return trim_case_custom(argv, q, in_buf);
+  if (mutator && mutator->afl_custom_trim)
+    return trim_case_custom(argv, q, in_buf);
 
   static u8 tmp[64];
   static u8 clean_trace[MAP_SIZE];