diff --git a/pkg/cli/crawl/request_modifiers.go b/pkg/cli/crawl/request_modifiers.go
index c299d7d..129941e 100644
--- a/pkg/cli/crawl/request_modifiers.go
+++ b/pkg/cli/crawl/request_modifiers.go
@@ -17,14 +17,12 @@ func addUserAgentToRequest() crawler.RequestModifierFunc {
 func addPrefixUrlToRequest(prefixUrl string) crawler.RequestModifierFunc {
 	return func(req *http.Request) {
 		parsedPrefixUrl, err := url.Parse(prefixUrl)
-		if err != nil {
+		if err != nil || parsedPrefixUrl.String() == "" {
+			// prefix url couldn't be parsed just abort
 			return
 		}
 
-		requestUrl, err := url.Parse(req.URL.String())
-		if err != nil {
-			return
-		}
+		requestUrl, _ := url.Parse(req.URL.String())
 
 		requestUrl.Scheme = parsedPrefixUrl.Scheme
 		requestUrl.Host = parsedPrefixUrl.Host
diff --git a/pkg/cli/crawl/request_modifiers_test.go b/pkg/cli/crawl/request_modifiers_test.go
index d10b689..ef0feab 100644
--- a/pkg/cli/crawl/request_modifiers_test.go
+++ b/pkg/cli/crawl/request_modifiers_test.go
@@ -44,6 +44,18 @@ func TestAddPrefixUrlToRequest(t *testing.T) {
 	}
 }
 
+func TestAddPrefixUrlToRequestWithInvalidPrefixUrl(t *testing.T) {
+	prefixUrl := "https://this is not a valid url"
+
+	modifier := crawler.RequestModifier{}
+	modifier.With(addPrefixUrlToRequest(prefixUrl))
+
+	req := httptest.NewRequest("GET", "https://example.com", strings.NewReader(""))
+	modifier.Do(req)
+
+	assert.Equal(t, "https://example.com", req.URL.String())
+}
+
 func TestAddCookiesToRequest(t *testing.T) {
 	modifier := crawler.RequestModifier{}
 	modifier.With(addCookiesToRequest(crawlerFlagOptions{
diff --git a/pkg/filter/status_rules_test.go b/pkg/filter/status_rules_test.go
index 59bebdf..fd4f15c 100644
--- a/pkg/filter/status_rules_test.go
+++ b/pkg/filter/status_rules_test.go
@@ -53,6 +53,14 @@ func TestRuleIsGreaterThan(t *testing.T) {
 	assert.Equal(t, ResultDoesNotApply, RuleIsGreaterThan("200-299", 200))
 }
 
+func TestRuleIsGreaterThanInvalidQuery(t *testing.T) {
+	assert.Equal(t, ResultDoesNotApply, RuleIsGreaterThan(">test", 200))
+}
+
+func TestRuleIsSmallerThanInvalidQuery(t *testing.T) {
+	assert.Equal(t, ResultDoesNotApply, RuleIsSmallerThan("<test", 200))
+}
+
 func TestRuleIsSmallerThan(t *testing.T) {
 	assert.Equal(t, ResultTrue, RuleIsSmallerThan("<400", 399))
 	assert.Equal(t, ResultFalse, RuleIsSmallerThan("<400", 400))