Fix crash when passed a filename with no extension

1 files changed, 1 insertions, 1 deletions

diff --git a/blastem.c b/blastem.c
index 684b91f..cef9371 100644
--- a/blastem.c
+++ b/blastem.c
@@ -137,7 +137,7 @@ uint32_t load_rom(const char * filename, void **dst, system_type *stype)
 {
 	uint8_t header[10];
 	char *ext = path_extension(filename);
-	if (!strcasecmp(ext, "zip")) {
+	if (ext && !strcasecmp(ext, "zip")) {
 		free(ext);
 		return load_rom_zip(filename, dst);
 	}