diff --git a/metals/src/main/scala/scala/meta/internal/metals/MetalsEnrichments.scala b/metals/src/main/scala/scala/meta/internal/metals/MetalsEnrichments.scala
index b00b90bf99f..e53f686a3af 100644
--- a/metals/src/main/scala/scala/meta/internal/metals/MetalsEnrichments.scala
+++ b/metals/src/main/scala/scala/meta/internal/metals/MetalsEnrichments.scala
@@ -971,7 +971,8 @@ object MetalsEnrichments
       val ld = new l.Diagnostic(
         diag.getRange.toLsp,
         fansi.Str(diag.getMessage, ErrorMode.Strip).plainText,
-        diag.getSeverity.toLsp,
+        if (diag.getSeverity == null) l.DiagnosticSeverity.Warning
+        else diag.getSeverity.toLsp,
         if (diag.getSource == null) "scalac" else diag.getSource,
       )
       Option(diag.getCode()).foreach { code =>