diff --git a/include/neuron/type.h b/include/neuron/type.h
index ec1bcfeb..826b966f 100644
--- a/include/neuron/type.h
+++ b/include/neuron/type.h
@@ -29,6 +29,7 @@ extern "C" {
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <string.h>
 
 #include <jansson.h>
 
@@ -246,6 +247,8 @@ static inline char *neu_value_str(neu_type_e type, neu_value_u value)
 {
     static __thread char str[128] = { 0 };
 
+    memset(str, 0, sizeof(str));
+
     switch (type) {
     case NEU_TYPE_INT8:
         snprintf(str, sizeof(str), "type: %s, value: %i", neu_type_string(type),
@@ -314,6 +317,7 @@ static inline char *neu_value_str(neu_type_e type, neu_value_u value)
         char *result = json_dumps(value.json, JSON_REAL_PRECISION(16));
         snprintf(str, sizeof(str), "type: %s, value: %s", neu_type_string(type),
                  result);
+        free(result);
         break;
     }
     default:
diff --git a/src/adapter/driver/cache.c b/src/adapter/driver/cache.c
index 31fd318d..cfe79ec4 100644
--- a/src/adapter/driver/cache.c
+++ b/src/adapter/driver/cache.c
@@ -668,7 +668,8 @@ void neu_driver_cache_update_change(neu_driver_cache_t *cache,
             elem->value.value.ptr.ptr = calloc(1, value.value.ptr.length);
             memcpy(elem->value.value.ptr.ptr, value.value.ptr.ptr,
                    value.value.ptr.length);
-        } else if (value.type == NEU_TYPE_CUSTOM) {
+        } else if (value.type == NEU_TYPE_CUSTOM ||
+                   value.type == NEU_TYPE_ERROR) {
             if (elem->value.type == NEU_TYPE_CUSTOM &&
                 elem->value.value.json != NULL) {
                 json_decref(elem->value.value.json);