1 files changed, 4 insertions, 0 deletions
diff --git a/src/printf.c b/src/printf.c
index 5af8362..7c0c8db 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -255,6 +255,10 @@ static int bfs_printf_F(CFILE *cfile, const struct bfs_printf *directive, const
 	}
 
 	const char *type = bfs_fstype(directive->ptr, statbuf);
+	if (!type) {
+		return -1;
+	}
+
 	return dyn_fprintf(cfile->file, directive, type);
 }