Audit logging module nullcheck during filtering

modules/audit-logging/src/Volo.Abp.AuditLogging.EntityFrameworkCore/Volo/Abp/AuditLogging/EntityFrameworkCore/EfCoreAuditLogRepository.cs

@@ -29,8 +29,8 @@ namespace Volo.Abp.AuditLogging.EntityFrameworkCore
         {
             var query = DbSet.AsNoTracking()
                 .IncludeDetails(includeDetails)
-                .WhereIf(httpMethod != null, q => q.HttpMethod.ToLowerInvariant() == httpMethod.ToLowerInvariant())
-                .WhereIf(url != null, q => q.Url.ToLowerInvariant().Contains(url.ToLowerInvariant()))
+                .WhereIf(httpMethod != null, q => q.HttpMethod != null && q.HttpMethod.ToLowerInvariant() == httpMethod.ToLowerInvariant())
+                .WhereIf(url != null, q => q.Url != null && q.Url.ToLowerInvariant().Contains(url.ToLowerInvariant()))
                 .WhereIf(httpStatusCode != null && httpStatusCode > 0, q => q.HttpStatusCode == (int?)httpStatusCode);
 
             var totalCount = await query.LongCountAsync();