NullPointerException: Attempt to invoke virtual method 'int java.util.AbstractCollection.size()' on a null object reference

[Illia Achour]

Hi AdMob team,

We’re seeing a recurrent crash inside the Google Mobile Ads SDK (com.google.android.gms:play-services-ads:24.8.0) on ChromeOS devices (AMD Stoney Ridge Chromebooks). None of our app code is involved.

Android 11

SDK version: 24.8.0

Device: Google Cros AMD Stoney Ridge Chromebook

Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.AbstractCollection.size()' on a null object reference
   at com.google.android.gms.internal.ads.zzgtb.<init>(com.google.android.gms:play-services-ads@@24.8.0:1)
   at com.google.android.gms.internal.ads.zzgtd.<clinit>(com.google.android.gms:play-services-ads@@24.8.0:1)
   at com.google.android.gms.internal.ads.zzgtd.zzt(com.google.android.gms:play-services-ads@@24.8.0:2)
   at com.google.android.gms.internal.ads.zzgtd.zzq(com.google.android.gms:play-services-ads@@24.8.0:6)
   at com.google.android.gms.internal.ads.zzgtd.zzp(zzgtd.java:1)
   at com.google.android.gms.internal.ads.zzgym.zzn(com.google.android.gms:play-services-ads@@24.8.0:1)
   at com.google.android.gms.internal.ads.zzdzp.zzl(zzdzp.java:47)
   at com.google.android.gms.internal.ads.zzdze.run(zzdze.java:1)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
   at java.lang.Thread.run(Thread.java:923)

We unfortunately cannot reproduce this crash on any of our test devices or emulators, and we don’t know the exact conditions that trigger it. Since it happens entirely inside SDK internals, we’re hoping you can analyze the possible code paths that lead to a null collection being passed.

[Mobile Ads SDK Forum Advisor]

Hi,

Thank you for contacting Mobile Ads SDK Support team.

The NullPointerException you're encountering within the Google Mobile Ads SDK (com.google.android.gms:play-services-ads:24.8.0) appears to be caused by a null collection being passed to a method that expects a non-null collection (specifically, the size() method is being invoked on a null object).

Could you confirm whether the mentioned issue is reproducible in the Google Sample project?

Could you kindly provide the below information privately so I will raise this issue with the wider team.

• Sample project reproducing the issue
• The full crash logs
• How often does this occur (recent frequency and number of impacted users)

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Thanks,

 

Mobile Ads SDK Team

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[2025-12-02 07:08:04Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01vUe3s:ref" (ADR-00346360)