diff --git a/handler.go b/handler.go
index cbda5dd..696b7a6 100644
--- a/handler.go
+++ b/handler.go
@@ -5,6 +5,8 @@ import (
 	"strconv"
 	"strings"
 
+	"runtime/debug"
+
 	"gitbase.de/gopackage/mgocrud"
 	"github.com/gin-gonic/gin"
 	mgo "gopkg.in/mgo.v2"
@@ -25,6 +27,7 @@ func (api *API) collectionGetOneHandler(m mgocrud.ModelInterface) gin.HandlerFun
 			if err != nil {
 				c.JSON(400, gin.H{
 					"error": "select: " + err.Error(),
+					"stack": string(debug.Stack()),
 				})
 				return
 			}
@@ -37,6 +40,7 @@ func (api *API) collectionGetOneHandler(m mgocrud.ModelInterface) gin.HandlerFun
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": "select: " + err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -49,6 +53,7 @@ func (api *API) collectionGetOneHandler(m mgocrud.ModelInterface) gin.HandlerFun
 			}
 			c.JSON(status, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -61,6 +66,7 @@ func (api *API) collectionGetOneHandler(m mgocrud.ModelInterface) gin.HandlerFun
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -97,6 +103,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			if err != nil {
 				c.JSON(400, gin.H{
 					"error": "filter: " + err.Error(),
+					"stack": string(debug.Stack()),
 				})
 				return
 			}
@@ -109,6 +116,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": "filter: " + err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -126,6 +134,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 				if err != nil {
 					c.JSON(400, gin.H{
 						"error": "select: " + err.Error(),
+						"stack": string(debug.Stack()),
 					})
 					return
 				}
@@ -139,6 +148,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": "select: " + err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -162,6 +172,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			if err != nil {
 				c.JSON(500, gin.H{
 					"error": err.Error(),
+					"stack": string(debug.Stack()),
 				})
 				return
 			}
@@ -180,6 +191,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			if err != nil {
 				c.JSON(500, gin.H{
 					"error": err.Error(),
+					"stack": string(debug.Stack()),
 				})
 				return
 			}
@@ -189,6 +201,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -201,6 +214,7 @@ func (api *API) collectionGetHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -223,6 +237,7 @@ func (api *API) collectionPostHandler(m mgocrud.ModelInterface) gin.HandlerFunc
 		if err := c.Bind(newM); err != nil {
 			c.JSON(400, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -238,6 +253,7 @@ func (api *API) collectionPostHandler(m mgocrud.ModelInterface) gin.HandlerFunc
 		}, newM, nil); err != nil {
 			c.JSON(400, gin.H{
 				"error":      err.Error(),
+				"stack":      string(debug.Stack()),
 				"apiContext": "validateObject",
 			})
 			return
@@ -247,6 +263,7 @@ func (api *API) collectionPostHandler(m mgocrud.ModelInterface) gin.HandlerFunc
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error":      err.Error(),
+				"stack":      string(debug.Stack()),
 				"apiContext": "createDocument",
 			})
 			return
@@ -258,6 +275,7 @@ func (api *API) collectionPostHandler(m mgocrud.ModelInterface) gin.HandlerFunc
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error":      err.Error(),
+				"stack":      string(debug.Stack()),
 				"apiContext": "readDocument",
 			})
 			return
@@ -270,6 +288,7 @@ func (api *API) collectionPostHandler(m mgocrud.ModelInterface) gin.HandlerFunc
 		}, readM, nil); err != nil {
 			c.JSON(400, gin.H{
 				"error":      err.Error(),
+				"stack":      string(debug.Stack()),
 				"apiContext": "savedObject",
 			})
 			return
@@ -283,6 +302,7 @@ func (api *API) collectionPostHandler(m mgocrud.ModelInterface) gin.HandlerFunc
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -305,6 +325,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			}
 			c.JSON(status, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -314,6 +335,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err := c.Bind(newM); err != nil {
 			c.JSON(400, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -322,6 +344,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if newM.GetID() != nil {
 			c.JSON(400, gin.H{
 				"error": "id not allowed in update",
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -336,6 +359,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			if err != nil {
 				c.JSON(500, gin.H{
 					"error": err.Error(),
+					"stack": string(debug.Stack()),
 				})
 				return
 			}
@@ -344,6 +368,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			if err != nil {
 				c.JSON(400, gin.H{
 					"error": err.Error(),
+					"stack": string(debug.Stack()),
 				})
 				return
 			}
@@ -394,6 +419,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		}, orgM, changes); err != nil {
 			c.JSON(400, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -402,6 +428,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -412,6 +439,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -423,6 +451,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		}, newM, changes); err != nil {
 			c.JSON(400, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -435,6 +464,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -459,6 +489,7 @@ func (api *API) collectionDeleteHandler(m mgocrud.ModelInterface) gin.HandlerFun
 			}
 			c.JSON(status, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 			return
 		}
@@ -467,6 +498,7 @@ func (api *API) collectionDeleteHandler(m mgocrud.ModelInterface) gin.HandlerFun
 		if err != nil {
 			c.JSON(500, gin.H{
 				"error": err.Error(),
+				"stack": string(debug.Stack()),
 			})
 		}