diff --git a/src/Sonarr.Api.V3/Config/NamingExampleResource.cs b/src/Sonarr.Api.V3/Config/NamingExampleResource.cs
index ed1bfbd92..d631fc00f 100644
--- a/src/Sonarr.Api.V3/Config/NamingExampleResource.cs
+++ b/src/Sonarr.Api.V3/Config/NamingExampleResource.cs
@@ -46,7 +46,7 @@ public static NamingConfig ToModel(this NamingConfigResource resource)
                 ReplaceIllegalCharacters = resource.ReplaceIllegalCharacters,
                 MultiEpisodeStyle = (MultiEpisodeStyle)resource.MultiEpisodeStyle,
                 ColonReplacementFormat = (ColonReplacementFormat)resource.ColonReplacementFormat,
-                CustomColonReplacementFormat = resource.CustomColonReplacementFormat,
+                CustomColonReplacementFormat = resource.CustomColonReplacementFormat ?? "",
                 StandardEpisodeFormat = resource.StandardEpisodeFormat,
                 DailyEpisodeFormat = resource.DailyEpisodeFormat,
                 AnimeEpisodeFormat = resource.AnimeEpisodeFormat,