--- a/src/appender/diurna_appender_file_write.c	2021-10-28 03:29:14.000000000 +0800
+++ b/src/appender/diurna_appender_file_write.c	2021-10-28 14:06:54.914359212 +0800
@@ -34,12 +34,20 @@ static inline const char *retrieve_filen
             if (strncmp(variable, "appname", 7) == 0) {
                 size_t appname_len = strlen(appname);
                 str_parsed = realloc(str_parsed, sizeof(char) * (allocated + appname_len) + 1);
+		if(!str_parsed){
+			printf("realloc fail\n");
+			return str_parsed;	
+		}
 
                 memcpy(str_parsed + idx_str_parsed, appname, appname_len);
                 idx_str_parsed += appname_len;
                 allocated += appname_len;
             } else if (strncmp(variable, "date", 4) == 0) {
                 str_parsed = realloc(str_parsed, sizeof(char) * allocated + 11);
+		if(!str_parsed){
+			printf("realloc fail\n");
+			return str_parsed;	
+		}
 
                 memcpy(str_parsed + idx_str_parsed, date, 10);
                 idx_str_parsed += 10;