diff --git a/Sieve/Services/SieveProcessor.cs b/Sieve/Services/SieveProcessor.cs
index cf54d31..4b4cec3 100644
--- a/Sieve/Services/SieveProcessor.cs
+++ b/Sieve/Services/SieveProcessor.cs
@@ -186,6 +186,8 @@ public SieveProcessor(IOptions<SieveOptions> options)
                         {
                             propertyValue = Expression.PropertyOrField(propertyValue, part);
                         }
+                        
+                        if (filterTerm.Values == null) continue;
 
                         foreach (var filterTermValue in filterTerm.Values)
                         {