diff --git a/util/semver/nuget_test.go b/util/semver/nuget_test.go
index 7851a91..11253c0 100644
--- a/util/semver/nuget_test.go
+++ b/util/semver/nuget_test.go
@@ -74,6 +74,8 @@ var nugetVersionParseTests = []versionParseTest{
 	v("1.*.*", "version has multiple wildcards in `1.*.*`", ""),
 	v("1.0.0*-alpha", "missing asterisk at end of prerelease in `1.0.0*-alpha`", ""),
 	v("1.0.0-a*a*", "invalid text in version string in `1.0.0-a*a*`", ""),
+	v("1*.", "invalid text in version string in `1*.`", ""),
+	v("1*-", "empty pre-release metadata in `1*-`", ""),
 }
 
 func TestNuGetVersionParse(t *testing.T) {
diff --git a/util/semver/version.go b/util/semver/version.go
index d7c296e..4ca1024 100644
--- a/util/semver/version.go
+++ b/util/semver/version.go
@@ -526,9 +526,12 @@ func (p *versionParser) version() (*Version, error) {
 		// NuGet allows for the metadata part to start and end with an
 		// asterisk.
 		r = p.lex.next()
-		if r != eof {
+		if r == '-' {
 			p.isPrerelease = true
 			r = p.metadata(&p.pre, false, "pre-release")
+			if len(p.pre) == 0 {
+				return nil, p.lex.err
+			}
 			l := p.pre[len(p.pre)-1]
 			if l[len(l)-1] != '*' {
 				p.lex.setErr("missing asterisk at end of prerelease")