diff --git a/libs/esl/src/esl_json.c b/libs/esl/src/esl_json.c
index 176c4603a5..df5a88135d 100644
--- a/libs/esl/src/esl_json.c
+++ b/libs/esl/src/esl_json.c
@@ -204,7 +204,7 @@ static const char *parse_string(cJSON *item,const char *str)
 					break;
 				default:  *ptr2++=*ptr; break;
 			}
-			ptr++;
+			if (*ptr) ptr++;
 		}
 	}
 	*ptr2=0;
diff --git a/libs/libks/src/ks_json.c b/libs/libks/src/ks_json.c
index ffa965a609..63529e7b5b 100644
--- a/libs/libks/src/ks_json.c
+++ b/libs/libks/src/ks_json.c
@@ -204,7 +204,7 @@ static const char *parse_string(cJSON *item,const char *str)
 					break;
 				default:  *ptr2++=*ptr; break;
 			}
-			ptr++;
+			if (*ptr) ptr++;
 		}
 	}
 	*ptr2=0;
diff --git a/src/switch_json.c b/src/switch_json.c
index 487843df64..c3c25364da 100644
--- a/src/switch_json.c
+++ b/src/switch_json.c
@@ -204,7 +204,7 @@ static const char *parse_string(cJSON *item,const char *str)
 					break;
 				default:  *ptr2++=*ptr; break;
 			}
-			ptr++;
+			if (*ptr) ptr++;
 		}
 	}
 	*ptr2=0;