onShow action fired Twice

[vvscode]

Env:

Ember 1.13.11
Ember Data 1.13.16
jQuery 2.1.4
idx-modal 1.4

on open modal I have two calls for onShow action

First one stack:

onShow (controller.js:374)
send (ember.debug.js:34011)
triggerAction (ember.debug.js:37682)
sendAction (ember.debug.js:47838)
open (modal.js:134)
(anonymous function) (modal.js:232)
applyStr (ember.debug.js:23674)
sendEvent (ember.debug.js:17190)
notifyObservers (ember.debug.js:20733)
propertyDidChange (ember.debug.js:20529)
set (ember.debug.js:21015)
set (ember.debug.js:36772)
_propagateAttrsToThis (ember.debug.js:44084)
_internalDidReceiveAttrs (ember.debug.js:44096)
trigger (ember.debug.js:48358)
superWrapper (ember.debug.js:23278)
Renderer.componentUpdateAttrs (ember.debug.js:13126)
(anonymous function) (ember.debug.js:10831)
instrument (ember.debug.js:11586)
ComponentNodeManager.rerender (ember.debug.js:10825)
componentHook (ember.debug.js:8114)
handleRedirect (ember.debug.js:52007)
block (ember.debug.js:51979)
block (ember.debug.js:51210)
(anonymous function) (ember.debug.js:51298)
dirtyCheck (ember.debug.js:51353)
block (ember.debug.js:51297)
RenderResult.populateNodes (ember.debug.js:52875)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
inline (ember.debug.js:51304)
RenderResult.populateNodes (ember.debug.js:52877)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
block (ember.debug.js:51297)
RenderResult.populateNodes (ember.debug.js:52875)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
content (ember.debug.js:51311)
RenderResult.populateNodes (ember.debug.js:52879)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
content (ember.debug.js:51311)
RenderResult.populateNodes (ember.debug.js:52879)
RenderResult.revalidateWith (ember.debug.js:52849)
RenderResult.revalidate (ember.debug.js:52826)
Renderer_revalidateTopLevelView (ember.debug.js:12995)
revalidate (ember.debug.js:50807)
invoke (ember.debug.js:1021)
flush (ember.debug.js:1085)
flush (ember.debug.js:886)
end (ember.debug.js:175)
run (ember.debug.js:297)
run (ember.debug.js:21138)
handler (ember.debug.js:24474)
(anonymous function) (ember.debug.js:46810)
dispatch (jquery.js:4435)
elemData.handle (jquery.js:4121)

And second one

onShow (controller.js:374)
send (ember.debug.js:34011)
triggerAction (ember.debug.js:37682)
sendAction (ember.debug.js:47838)
open (modal.js:134)
(anonymous function) (modal.js:232)
applyStr (ember.debug.js:23674)
sendEvent (ember.debug.js:17190)
notifyObservers (ember.debug.js:20733)
propertyDidChange (ember.debug.js:20529)
set (ember.debug.js:21015)
set (ember.debug.js:36772)
_propagateAttrsToThis (ember.debug.js:44084)
_internalDidReceiveAttrs (ember.debug.js:44096)
trigger (ember.debug.js:48358)
superWrapper (ember.debug.js:23278)
Renderer.componentUpdateAttrs (ember.debug.js:13126)
(anonymous function) (ember.debug.js:10831)
instrument (ember.debug.js:11586)
ComponentNodeManager.rerender (ember.debug.js:10825)
componentHook (ember.debug.js:8114)
handleRedirect (ember.debug.js:52007)
block (ember.debug.js:51979)
block (ember.debug.js:51210)
(anonymous function) (ember.debug.js:51298)
dirtyCheck (ember.debug.js:51353)
block (ember.debug.js:51297)
RenderResult.populateNodes (ember.debug.js:52875)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
inline (ember.debug.js:51304)
RenderResult.populateNodes (ember.debug.js:52877)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
block (ember.debug.js:51297)
RenderResult.populateNodes (ember.debug.js:52875)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
content (ember.debug.js:51311)
RenderResult.populateNodes (ember.debug.js:52879)
RenderResult.revalidateWith (ember.debug.js:52849)
validateChildMorphs (ember.debug.js:53211)
dirtyCheck (ember.debug.js:51358)
content (ember.debug.js:51311)
RenderResult.populateNodes (ember.debug.js:52879)
RenderResult.revalidateWith (ember.debug.js:52849)
RenderResult.revalidate (ember.debug.js:52826)
Renderer_revalidateTopLevelView (ember.debug.js:12995)
revalidate (ember.debug.js:50807)
invoke (ember.debug.js:1021)
flush (ember.debug.js:1085)
flush (ember.debug.js:886)
end (ember.debug.js:175)
run (ember.debug.js:297)
run (ember.debug.js:21138)
handler (ember.debug.js:24474)
(anonymous function) (ember.debug.js:46810)
dispatch (jquery.js:4435)
elemData.handle (jquery.js:4121)

Current workaround for critical places is

onShow: _.debounce(function() {
// code
}, 500);

but it ugly