Merge pull request #4811 from wuxiaojun514/4808

Hotfix for Issue 4808

Author: KoenZomers

CHANGELOG.md

@@ -122,6 +122,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed `-Description` and `-Sequence` not being applied when providing these through `Add-PnPApplicationCustomizer` [#4767](https://github.com/pnp/powershell/pull/4767)
 - Fixed `-RetryCount` parameter being ignored with `Submit-PnPSearchQuery` [#4784](https://github.com/pnp/powershell/pull/4784)
 - Fixed `Get-PnPSiteScriptFromWeb` throwing a file not found error when providing a web URL through `-Url` that differed from the connected to URL [#4785](https://github.com/pnp/powershell/pull/4785)
+- Fixed `Set-PnPListItem -Values @{}` passing in a taxonomy field with a guid typed value throwing an error [#4811](https://github.com/pnp/powershell/pull/4811)
 
 ### Removed
 

src/Commands/Utilities/ListItemHelper.cs

@@ -166,7 +166,7 @@ public static void SetFieldValues(this ListItem item, Hashtable valuesToSet, Bas
                                     var taxSession = clonedContext.Site.GetTaxonomySession();
                                     TaxonomyItem taxonomyItem = null;
                                     bool updateTaxItemValue = true;
-                                    if (value != null && !Guid.TryParse(value as string, out termGuid))
+                                    if (value != null && !Guid.TryParse(value?.ToString(), out termGuid))
                                     {
                                         // Assume it's a TermPath
                                         taxonomyItem = clonedContext.Site.GetTaxonomyItemByPath(value as string);