QGIS » QGIS Application

I have created a plugin which selects objects from a PostGIS table by rectangle and puts it into new Memory Layer. Type of geometry in PostGis table - MultiLineString. Adding features to the Memory Layer (its type also MultiLineString) is done successfully. But if you try zoom to Layer and perform any manipulations with map, QGIS is going to crash.
This situation occurs in QGIS 2.10. In 2.8.2 it worked well. Therefore I tried to convert MultiLineString to LineString - QGIS does not crashs, but it is unacceptable for work with some data...

Below is the example code for QGIS python console to reproduce situation and shapefile with some geometry data for tests.

Steps for reproduce:
1. Load shapefile into PostGIS base;
2. Paste code to console, editing parameters for connections. (It will create new memory layer "Result_Layer" and put to it data from PostGIS table "test_shape");
3. Press "Zoom to Layer" to see geometry. (Now we see, that all features have been added);
4. try Zoom In, Zoom Out, Pan map or some any manipulation with map extent in "Result_Layer" area.
5. QGIS CRASH.

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from PyQt4.QtSql import *

self = qgis.utils
uri = QgsDataSourceURI()
uri.setConnection("10.1.1.6", "5432", "Database", "Username", "Password")
 # "test shape" - Our layer name in base after import from shapefile.
 # "public" - schema
uri.setDataSource("public", "test_shape", "geom", "", "gid")
vlayer=QgsVectorLayer(uri.uri(), "tot", "postgres")

resultl = QgsVectorLayer("MultiLineString", "Result_select", "memory")
QgsMapLayerRegistry.instance().addMapLayer(resultl, True)
resultpr = resultl.dataProvider()
for feature in vlayer.getFeatures():
            resultpr.addFeatures([feature])

self.iface.mapCanvas().refresh()
print 'done'