ConcurrentCache throws NullReferenceException

We are using the ConcurrentCache class from DotNext.Runtime.Caching in our project, with the LFU eviction policy.

We access values using the TryGetValue function, and assign values using the indexing operator.

// Initialize the cache
int capacity = 10000;
var cache = new ConcurrentCache<string, string>(capacity, CacheEvictionPolicy.LFU);

// Get value
bool success = cache.TryGetValue(key, out var value);
// Set value
cache[key] = newValue;

We used this in our project and ran it with multiple threads running simultaneously and after some time it crashed with a NullReferenceException. There is no specific instance that it crashes on, every time we run it it crashes at a different point.

Below is the full error:

Object reference not set to an instance of an object.
 at DotNext.Runtime.Caching.ConcurrentCache`2.DrainQueue()
 at DotNext.Runtime.Caching.ConcurrentCache`2.EnqueueAndDrain(Func`2 invoker, KeyValuePair target)
 at DotNext.Runtime.Caching.ConcurrentCache`2.TryGetValue(TKey key, IEqualityComparer`1 keyComparer, Int32 hashCode, TValue& value)

Any advice would be much appreciated!

Thank you

[sakno]

A new version has been published.

[shaltielshmid]

Works perfectly! Thank you!