diff --git a/constants/Games.ts b/constants/Games.ts
index 11d1850dd..2ab5aaf02 100644
--- a/constants/Games.ts
+++ b/constants/Games.ts
@@ -1,6 +1,6 @@
 import { GameState } from '@root/helpers/gameStateHelpers';
 import { isCompletePathology, isCompleteSokopath } from '@root/helpers/validators/isComplete';
-import validatePathologySolution, { validatePathologyLevelValid as validatePathologyLevel } from '@root/helpers/validators/validatePathology';
+import validatePathologySolution, { validatePathologyLevel } from '@root/helpers/validators/validatePathology';
 import validateSokopathSolution, { validateSokopathLevel } from '@root/helpers/validators/validateSokopath';
 import Level from '@root/models/db/level';
 import AchievementCategory from './achievements/achievementCategory';
diff --git a/helpers/validators/validatePathology.ts b/helpers/validators/validatePathology.ts
index 448f25f0d..acb5ca7d8 100644
--- a/helpers/validators/validatePathology.ts
+++ b/helpers/validators/validatePathology.ts
@@ -75,7 +75,7 @@ export default function validatePathologySolution(directions: Direction[], level
   return endIndices.includes(pos.y * level.width + pos.x);
 }
 
-export function validatePathologyLevelValid(data: string): { valid: boolean, reasons: string[] } {
+export function validatePathologyLevel(data: string): { valid: boolean, reasons: string[] } {
   // data must have at least ONE start and ONE end
   const reasons = [];
   const dataSplit = data.split('\n');
@@ -95,6 +95,10 @@ export function validatePathologyLevelValid(data: string): { valid: boolean, rea
           endCount++;
         }
       }
+
+      if (TileTypeHelper.isOnExit(tileType)) {
+        reasons.push(`Invalid tile type: ${tileType}`);
+      }
     }
   }
 
diff --git a/tests/helpers/helpers.test.ts b/tests/helpers/helpers.test.ts
index b0626b34a..555bef2e8 100644
--- a/tests/helpers/helpers.test.ts
+++ b/tests/helpers/helpers.test.ts
@@ -1,7 +1,7 @@
 import TileType from '@root/constants/tileType';
 import { generatePassword } from '@root/helpers/generatePassword';
 import { parseHostname, parseSubdomain } from '@root/helpers/parseUrl';
-import { validatePathologyLevelValid } from '@root/helpers/validators/validatePathology';
+import { validatePathologyLevel } from '@root/helpers/validators/validatePathology';
 import { validateSokopathLevel } from '@root/helpers/validators/validateSokopath';
 import TestId from '../../constants/testId';
 import getDifficultyEstimate from '../../helpers/getDifficultyEstimate';
@@ -136,14 +136,16 @@ describe('helpers/*.ts', () => {
     expect(parseHostname('localhost')).toBe('localhost');
     expect(parseHostname('')).toBe(null);
   });
-  test('validatePathologyLevelValid', async () => {
+  test('validatePathologyLevel', async () => {
     const emptyGrid = '000';
     const gridWithOnlyOneStart = '00' + TileType.Player;
     const gridWithOneStartAndOneEnd = '00' + TileType.Player + TileType.Exit;
+    const gridWithInvalidTile = '0' + TileType.PlayerOnExit + TileType.Player + TileType.Exit;
 
-    expect(validatePathologyLevelValid(emptyGrid).reasons).toMatchObject(['Must have exactly one player', 'Must have at least one exit']);
-    expect(validatePathologyLevelValid(gridWithOnlyOneStart).reasons).toMatchObject(['Must have at least one exit']);
-    expect(validatePathologyLevelValid(gridWithOneStartAndOneEnd).valid).toBe(true);
+    expect(validatePathologyLevel(emptyGrid).reasons).toMatchObject(['Must have exactly one player', 'Must have at least one exit']);
+    expect(validatePathologyLevel(gridWithOnlyOneStart).reasons).toMatchObject(['Must have at least one exit']);
+    expect(validatePathologyLevel(gridWithOneStartAndOneEnd).valid).toBe(true);
+    expect(validatePathologyLevel(gridWithInvalidTile).reasons).toMatchObject([`Invalid tile type: ${TileType.PlayerOnExit}`]);
   });
   test('validiateSokopathLevelValid', async () => {
     const emptyGrid = '000';