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-rw-r--r--libavutil/log.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavutil/log.c b/libavutil/log.c
index ddfd31f6c3..c44130c26e 100644
--- a/libavutil/log.c
+++ b/libavutil/log.c
@@ -104,7 +104,7 @@ void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
- print_prefix= line[strlen(line)-1] == '\n';
+ print_prefix = strlen(line) && line[strlen(line)-1] == '\n';
#if HAVE_ISATTY
if(!is_atty) is_atty= isatty(2) ? 1 : -1;