diff --git a/src/Destroy.ts b/src/Destroy.ts
index 249a7ad2c..c5b5e04db 100644
--- a/src/Destroy.ts
+++ b/src/Destroy.ts
@@ -4,11 +4,18 @@
  */
 
 export function objectDestroy(object: any) {
-  for (const [key, value] of Object.entries(object)) {
+  if (object === null || typeof object !== 'object') {
+    return
+  }
+  for (const key of Object.keys(object)) {
+    if (!Object.prototype.hasOwnProperty.call(object, key)) {
+      continue
+    }
+    const value = object[key]
     if (value instanceof Function) {
-      (object as Record<string, any>)[key] = postMortem(value)
+      object[key] = postMortem(value)
     } else {
-      delete (object as Record<string, any>)[key]
+      delete object[key]
     }
   }
 }
diff --git a/src/NumberLiteralHelper.ts b/src/NumberLiteralHelper.ts
index 8d7a526ce..82c145667 100644
--- a/src/NumberLiteralHelper.ts
+++ b/src/NumberLiteralHelper.ts
@@ -13,8 +13,9 @@ export class NumberLiteralHelper {
   constructor(
     private readonly config: Config
   ) {
-    const thousandSeparator = this.config.thousandSeparator === '.' ? `\\${this.config.thousandSeparator}` : this.config.thousandSeparator
-    const decimalSeparator = this.config.decimalSeparator === '.' ? `\\${this.config.decimalSeparator}` : this.config.decimalSeparator
+    const escapeRegex = (str: string): string => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+    const thousandSeparator = escapeRegex(this.config.thousandSeparator)
+    const decimalSeparator = escapeRegex(this.config.decimalSeparator)
 
     this.numberPattern = new RegExp(`^([+-]?((${decimalSeparator}\\d+)|(\\d+(${thousandSeparator}\\d{3,})*(${decimalSeparator}\\d*)?)))([eE][+-]?\\d+)?$`)
     this.allThousandSeparatorsRegex = new RegExp(`${thousandSeparator}`, 'g')