diff --git a/src/model/model.class.ts b/src/model/model.class.ts
index 0755b10..5b4883f 100644
--- a/src/model/model.class.ts
+++ b/src/model/model.class.ts
@@ -283,11 +283,14 @@ export class Model {
       return this.mutatePermutation();
     }
 
-    const partner = min + 1 == max ? min : Paul.chooseBetween(max, min, BIAS.REVERSE_BELL);
-    if (chosen == partner) {
-      // would that ever happen ?
-      return this.mutatePermutation();
+    let partner = min + 1 == max ? min : Paul.chooseBetween(max, min, BIAS.REVERSE_BELL);
+    while (chosen == partner) {
+      // if chosen is same as partner
+      // randomize until it isn't
+      // this will work on condition: there are more than two choices in range.
+      partner = Paul.chooseBetween(max, min, BIAS.REVERSE_BELL);
     }
+
     const [a] = Model._order.splice(chosen, 1);
 
     const b = Model._order[partner];