diff --git a/config/config.go b/config/config.go
index 6bd716949..51e2abd5e 100755
--- a/config/config.go
+++ b/config/config.go
@@ -306,6 +306,8 @@ var posibleLoaderTypes = utils.NewStringSet([]string{utils.MetaAttributes,
 	utils.MetaSuppliers, utils.MetaThresholds, utils.MetaChargers,
 	utils.MetaDispatchers, utils.MetaDispatcherHosts})
 
+var poisbleReaderType = utils.NewStringSet([]string{utils.MetaFileCSV})
+
 func (self *CGRConfig) checkConfigSanity() error {
 	// Rater checks
 	if self.ralsCfg.RALsEnabled && !self.dispatcherSCfg.Enabled {
@@ -664,6 +666,28 @@ func (self *CGRConfig) checkConfigSanity() error {
 			}
 		}
 	}
+	// EventReader sanity checks
+	if self.ersCfg.Enabled {
+		if !self.sessionSCfg.Enabled {
+			for _, connCfg := range self.ersCfg.SessionSConns {
+				if connCfg.Address == utils.MetaInternal {
+					return errors.New("SessionS not enabled but requested by EventReader component.")
+				}
+			}
+		}
+		for _, rdr := range self.ersCfg.Readers {
+			for _, dir := range []string{rdr.ProcessedPath, rdr.SourcePath} {
+				if _, err := os.Stat(dir); err != nil && os.IsNotExist(err) {
+					return fmt.Errorf("<%s> Nonexistent folder: %s for reader with ID: %s", utils.ERs, dir, rdr.ID)
+				}
+			}
+
+			if !poisbleReaderType.Has(rdr.Type) {
+				return fmt.Errorf("<%s> unsupported data type: %s for reader with ID: %s", utils.ERs, rdr.Type, rdr.ID)
+			}
+		}
+	}
+
 	return nil
 }
 
diff --git a/config/dataprovider.go b/config/dataprovider.go
index 0b2883279..d0cfca93e 100644
--- a/config/dataprovider.go
+++ b/config/dataprovider.go
@@ -81,7 +81,7 @@ func (objDP *ObjectDP) String() string {
 func (objDP *ObjectDP) FieldAsInterface(fldPath []string) (data interface{}, err error) {
 	// []string{ BalanceMap *monetary[0] Value }
 	var has bool
-	if data, has = objDP.getCache(strings.Join(fldPath, ".")); has {
+	if data, has = objDP.getCache(strings.Join(fldPath, utils.NestingSep)); has {
 		return
 	}
 
diff --git a/config/erscfg_test.go b/config/erscfg_test.go
index 7da527656..c17782175 100644
--- a/config/erscfg_test.go
+++ b/config/erscfg_test.go
@@ -215,3 +215,24 @@ func TestEventReaderLoadFromJSON(t *testing.T) {
 	}
 
 }
+
+func TestEventReaderSanitisation(t *testing.T) {
+	cfgJSONStr := `{
+"ers": {
+	"enabled": true,
+	"readers": [
+		{
+			"id": "file_reader1",
+			"run_delay": -1,
+			"type": "*file_csv",
+			"source_path": "/tmp/ers/in",
+			"processed_path": "/tmp/ers/out",
+		},
+	],
+}
+}`
+
+	if _, err := NewCGRConfigFromJsonStringWithDefaults(cfgJSONStr); err != nil {
+		t.Error(err)
+	}
+}