diff --git a/.wolfssl_known_macro_extras b/.wolfssl_known_macro_extras
index 6ec0d4cade..e691433d8f 100644
--- a/.wolfssl_known_macro_extras
+++ b/.wolfssl_known_macro_extras
@@ -463,6 +463,7 @@ STM32L475xx
 STM32L4A6xx
 STM32L552xx
 STM32L562xx
+STM32MP135Fxx
 STM32U575xx
 STM32U585xx
 STM32U5A9xx
diff --git a/src/ssl_sess.c b/src/ssl_sess.c
index b1e03cbbbe..d55633bba1 100644
--- a/src/ssl_sess.c
+++ b/src/ssl_sess.c
@@ -843,6 +843,7 @@ void wolfSSL_CTX_flush_sessions(WOLFSSL_CTX* ctx, long tm)
 #ifdef SESSION_CACHE_DYNAMIC_MEM
                 s != NULL &&
 #endif
+                s->sessionIDSz == ID_LEN &&
                 XMEMCMP(s->sessionID, id, ID_LEN) != 0 &&
                 s->bornOn + s->timeout < (word32)tm
                 )