1 files changed, 5 insertions, 0 deletions
diff --git a/src/diff_print.c b/src/diff_print.c
index 03d25b087..6c5a2cdc8 100644
--- a/src/diff_print.c
+++ b/src/diff_print.c
@@ -316,6 +316,11 @@ static int diff_print_oid_range(
 static int diff_delta_format_path(
 	git_str *out, const char *prefix, const char *filename)
 {
+	if (!filename) {
+		/* don't prefix "/dev/null" */
+ 		return git_str_puts(out, "/dev/null");
+	}
+
 	if (git_str_joinpath(out, prefix, filename) < 0)
 		return -1;