Ensure getVars only returns primitive values when value == <nil>

jsonlogic.go

@@ -423,8 +423,8 @@ func some(values, data interface{}) interface{} {
 	for _, value := range subject.([]interface{}) {
 		v := apply(
 			solveVars(
-				solveVars(parsed[1], value),
-				data,
+				solveVars(parsed[1], data),
+				value,
 			),
 			value,
 		)

jsonlogic_test.go

@@ -907,3 +907,28 @@ func TestIssue79(t *testing.T) {
 	expected := `true`
 	assert.JSONEq(t, expected, result.String())
 }
+
+func TestIssue81(t *testing.T) {
+	rule := `{
+      "some": [
+        {"var": "A"},
+        {"!=": [
+          {"var": ".B"},
+          {"var": "B"}
+        ]}
+      ]}
+         `
+
+	data := `{"A":[{"B":1}], "B":2}`
+
+	var result bytes.Buffer
+
+	err := Apply(strings.NewReader(rule), strings.NewReader(data), &result)
+
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := `true`
+	assert.JSONEq(t, expected, result.String())
+}

vars.go

@@ -45,7 +45,14 @@ func solveVars(values, data interface{}) interface{} {
 }
 
 func getVar(value, data interface{}) interface{} {
-	if value == nil || (isString(value) && toString(value) == "") {
+	if value == nil {
+		if !isPrimitive(data) {
+			return nil
+		}
+		return data
+	}
+
+	if isString(value) && toString(value) == "" {
 		return data
 	}