fix: alphaNumeric all chars banned (#550)

1 files changed, 10 insertions, 4 deletions

diff --git a/src/random.ts b/src/random.ts
index c2d8ecb2..dd58c3ce 100644
--- a/src/random.ts
+++ b/src/random.ts
@@ -479,11 +479,17 @@ export class Random {
       'y',
       'z',
     ];
-    if (options) {
-      if (options.bannedChars) {
-        charsArray = arrayRemove(charsArray, options.bannedChars);
-      }
+
+    if (options.bannedChars) {
+      charsArray = arrayRemove(charsArray, options.bannedChars);
     }
+
+    if (charsArray.length === 0) {
+      throw new Error(
+        'Unable to generate string, because all possible characters are banned.'
+      );
+    }
+
     for (let i = 0; i < count; i++) {
       wholeString += this.faker.random.arrayElement(charsArray);
     }