From 270d4c1ca8545d15cdd05a59bade5af869fd0f5d Mon Sep 17 00:00:00 2001
From: Diego Henrique Oliveira <diego@8arm.io>
Date: Wed, 18 Oct 2023 10:21:39 -0300
Subject: [PATCH] Ensure value is string before trying to convert it

---
 jsonlogic.go      |  1 +
 jsonlogic_test.go | 24 ++++++++++++++++++++++++
 vars.go           |  2 +-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/jsonlogic.go b/jsonlogic.go
index babe7f8..48a0320 100644
--- a/jsonlogic.go
+++ b/jsonlogic.go
@@ -6,6 +6,7 @@ import (
 	"io"
 	"sort"
 	"strings"
+	// "runtime/debug"
 
 	"github.com/mitchellh/copystructure"
 )
diff --git a/jsonlogic_test.go b/jsonlogic_test.go
index 07b0b02..aa9e548 100644
--- a/jsonlogic_test.go
+++ b/jsonlogic_test.go
@@ -741,6 +741,30 @@ func TestIssue58_example(t *testing.T) {
 	assert.JSONEq(t, expected, result.String())
 }
 
+func TestIssue70(t *testing.T) {
+	data := strings.NewReader(`{"people": [
+		{"age":18, "name":"John"},
+		{"age":20, "name":"Luke"},
+		{"age":18, "name":"Mark"}
+]}`)
+	logic := strings.NewReader(`{"filter": [
+	{"var": ["people"]},
+	{"==": [{"var": ["age"]}, 18]}
+]}`)
+
+	var result bytes.Buffer
+	err := Apply(logic, data, &result)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := `[
+    {"age": 18, "name": "John"},
+    {"age": 18, "name": "Mark"}
+]`
+	assert.JSONEq(t, expected, result.String())
+}
+
 func TestIssue71_example_empty_min(t *testing.T) {
 	data := strings.NewReader(`{}`)
 	logic := strings.NewReader(`{"min":[]}`)
diff --git a/vars.go b/vars.go
index 46294d5..d619e6e 100644
--- a/vars.go
+++ b/vars.go
@@ -12,7 +12,7 @@ func solveVars(values, data interface{}) interface{} {
 
 		for key, value := range values.(map[string]interface{}) {
 			if key == "var" {
-				if value == "" || strings.HasPrefix(value.(string), ".") {
+				if isString(value) && (value == "" || strings.HasPrefix(value.(string), ".")) {
 					logic["var"] = value
 					continue
 				}