diff --git a/store/local/job_spec_adapter.go b/store/local/job_spec_adapter.go
index 7ecaa87fd2..a5a155c6f2 100644
--- a/store/local/job_spec_adapter.go
+++ b/store/local/job_spec_adapter.go
@@ -463,9 +463,17 @@ func (adapt JobSpecAdapter) ToSpec(conf Job) (models.JobSpec, error) {
 
 	taskConf := models.JobSpecConfigs{}
 	for _, c := range conf.Task.Config {
+		name, ok := c.Key.(string)
+		if !ok {
+			return models.JobSpec{}, fmt.Errorf("spec reading error, failed to convert key %+v to string", c.Key)
+		}
+		value, ok := c.Value.(string)
+		if !ok {
+			return models.JobSpec{}, fmt.Errorf("spec reading error, failed to convert value %+v on key %s to string", c.Value, name)
+		}
 		taskConf = append(taskConf, models.JobSpecConfigItem{
-			Name:  c.Key.(string),
-			Value: c.Value.(string), // TODO: panics when value not valid, error with macros
+			Name:  name,
+			Value: value,
 		})
 	}
 
diff --git a/store/local/job_spec_adapter_test.go b/store/local/job_spec_adapter_test.go
index baa8fee2ac..8f3d36641b 100644
--- a/store/local/job_spec_adapter_test.go
+++ b/store/local/job_spec_adapter_test.go
@@ -236,6 +236,80 @@ hooks: []`
 		assert.Equal(t, expErr, actualErr)
 		assert.Equal(t, models.JobSpec{}, modelJob)
 	})
+	t.Run("should not convert job if task config is not string", func(t *testing.T) {
+		yamlSpec := `
+version: 1
+name: test_job
+owner: test@example.com
+schedule:
+  start_date: "2021-02-03"
+  interval: 0 2 * * *
+behavior:
+  depends_on_past: true
+  catch_up: false
+  notify:
+    - on: test
+      channel:
+        - test://hello
+task:
+  name: bq2bq
+  config:
+    PROJECT: example
+    DATASET: dataset
+    TABLE: table
+    SQL_TYPE: STANDARD
+    LOAD_METHOD: REPLACE
+    MAX_LINE: 100
+  window:
+    size: 168h
+    offset: 0
+    truncate_to: w
+labels:
+  orchestrator: optimus
+dependencies: 
+  - 
+    http: 
+      name: http-sensor-1
+      headers: 
+        Authentication: Token-1
+        Content-type: application/json
+      params: 
+        key-1: value-1
+        key-2: value-2
+      url: "https://optimus-host:80/serve/1/"
+  - 
+    http: 
+      name: http-sensor-2
+      headers: 
+        Authentication: Token-2
+        Content-type: application/json
+      params: 
+        key-3: value-3
+        key-4: value-4
+      url: "https://optimus-host:80/serve/2/"
+
+hooks: []`
+		var localJobParsed local.Job
+		err := yaml.Unmarshal([]byte(yamlSpec), &localJobParsed)
+		assert.Nil(t, err)
+
+		execUnit := new(mock.BasePlugin)
+		execUnit.On("PluginInfo").Return(&models.PluginInfoResponse{
+			Name: "bq2bq",
+		}, nil)
+
+		pluginRepo := new(mock.SupportedPluginRepo)
+		pluginRepo.On("GetByName", "bq2bq").Return(&models.Plugin{
+			Base: execUnit,
+		}, nil)
+		adapter := local.NewJobSpecAdapter(pluginRepo)
+
+		modelJob, actualErr := adapter.ToSpec(localJobParsed)
+
+		expErr := fmt.Errorf("spec reading error, failed to convert value 100 on key MAX_LINE to string")
+		assert.Equal(t, expErr, actualErr)
+		assert.Equal(t, models.JobSpec{}, modelJob)
+	})
 }
 
 func TestJob_MergeFrom(t *testing.T) {