diff --git a/internal/imports/mod.go b/internal/imports/mod.go
index 73f7a49587..ce3269a430 100644
--- a/internal/imports/mod.go
+++ b/internal/imports/mod.go
@@ -88,7 +88,11 @@ func (r *ModuleResolver) init() error {
 	if gmc := r.env.Env["GOMODCACHE"]; gmc != "" {
 		r.moduleCacheDir = gmc
 	} else {
-		r.moduleCacheDir = filepath.Join(filepath.SplitList(goenv["GOPATH"])[0], "/pkg/mod")
+		gopaths := filepath.SplitList(goenv["GOPATH"])
+		if len(gopaths) == 0 {
+			return fmt.Errorf("empty GOPATH")
+		}
+		r.moduleCacheDir = filepath.Join(gopaths[0], "/pkg/mod")
 	}
 
 	sort.Slice(r.modsByModPath, func(i, j int) bool {