diff --git a/internal/lsp/cache/check.go b/internal/lsp/cache/check.go
index 30e4af2a22..24136170c6 100644
--- a/internal/lsp/cache/check.go
+++ b/internal/lsp/cache/check.go
@@ -330,13 +330,16 @@ func typeCheck(ctx context.Context, fset *token.FileSet, m *metadata, mode sourc
 		return nil, ctx.Err()
 	}
 
-	for _, e := range rawErrors {
-		srcErr, err := sourceError(ctx, fset, pkg, e)
-		if err != nil {
-			log.Error(ctx, "unable to compute error positions", err, telemetry.Package.Of(pkg.ID()))
-			continue
+	// We don't care about a package's errors unless we have parsed it in full.
+	if mode == source.ParseFull {
+		for _, e := range rawErrors {
+			srcErr, err := sourceError(ctx, fset, pkg, e)
+			if err != nil {
+				log.Error(ctx, "unable to compute error positions", err, telemetry.Package.Of(pkg.ID()))
+				continue
+			}
+			pkg.errors = append(pkg.errors, srcErr)
 		}
-		pkg.errors = append(pkg.errors, srcErr)
 	}
 	return pkg, nil
 }