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-rw-r--r--ext/session/mod_mm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/session/mod_mm.c b/ext/session/mod_mm.c
index 704164aa4a..47e3418c86 100644
--- a/ext/session/mod_mm.c
+++ b/ext/session/mod_mm.c
@@ -278,7 +278,7 @@ PHP_MINIT_FUNCTION(ps_mm)
ps_mm_path = emalloc(save_path_len + 1 + (sizeof(PS_MM_FILE) - 1) + mod_name_len + euid_len + 1);
memcpy(ps_mm_path, PS(save_path), save_path_len);
- if (PS(save_path)[save_path_len - 1] != DEFAULT_SLASH) {
+ if (save_path_len && PS(save_path)[save_path_len - 1] != DEFAULT_SLASH) {
ps_mm_path[save_path_len] = DEFAULT_SLASH;
save_path_len++;
}