diff --git a/graph/ui-project-details/src/lib/target-configuration-details/target-configuration-details.util.ts b/graph/ui-project-details/src/lib/target-configuration-details/target-configuration-details.util.ts
index 268c7337c78c7..edc3219c082c9 100644
--- a/graph/ui-project-details/src/lib/target-configuration-details/target-configuration-details.util.ts
+++ b/graph/ui-project-details/src/lib/target-configuration-details/target-configuration-details.util.ts
@@ -11,7 +11,7 @@ export function selectSourceInfo(
       // When the key is a prefix of the filter, we can record it as the root source.
       // Use the most specific key for the root "." source value.
       // e.g. `targets.build` takes precedence over `targets`
-      if (!rootKey || key.startsWith(rootKey)) {
+      if (!rootKey || key?.startsWith(rootKey)) {
         rootKey = key;
         rootSource = value;
       }
diff --git a/graph/ui-tooltips/src/lib/sourcemap-info-tooltip.tsx b/graph/ui-tooltips/src/lib/sourcemap-info-tooltip.tsx
index b83d32a829c08..3d44c2c490b69 100644
--- a/graph/ui-tooltips/src/lib/sourcemap-info-tooltip.tsx
+++ b/graph/ui-tooltips/src/lib/sourcemap-info-tooltip.tsx
@@ -20,7 +20,7 @@ export function SourcemapInfoToolTip({
   // Every other property within in the target has the form `target.${targetName}.${propertyName}
   const isTarget = propertyKey.split('.').length === 2;
 
-  const docsUrlSlug: string | undefined = plugin.startsWith('@nx/')
+  const docsUrlSlug: string | undefined = plugin?.startsWith('@nx/')
     ? plugin.replace('@nx/', '').split('/')[0]
     : undefined;