diff --git a/src/services/challengeDataManagerService.ts b/src/services/challengeDataManagerService.ts
index 6ee13730484d8fc5952acc8096ac1321ab4bff38..3caae09537dcf2583ddcddd1b08a271eba58abaf 100644
--- a/src/services/challengeDataManagerService.ts
+++ b/src/services/challengeDataManagerService.ts
@@ -342,7 +342,7 @@ export default class ChallengeManager implements IChallengeManager {
    */
   public getViewingDate = (challenge: UserChallenge): DateTime => {
     const startingDate = challenge.startingDate
-    if (challenge && challenge.fluidTypes.length > 0) {
+    if (challenge && challenge.fluidTypes && challenge.fluidTypes.length > 0) {
       const lagDays = this.getLagDays(challenge.fluidTypes)
       return startingDate.plus({ days: lagDays })
     } else {