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Custom Reporters Frese Browser

See original GitHub issue

Expected behavior

When I drag custom blocks they should place.

Actual behavior

They freeze my browser and throw these errors:

vendor.js.pagespeed.jm.434JizBK7W.js:4 Uncaught TypeError: Cannot read property 

'targetConnection' of nullBlockly.BlockSvg.disconnectInsertionMarker @ 

vendor.js.pagespeed.jm.434JizBK7W.js:4Blockly.BlockSvg.terminateDrag @ 

vendor.js.pagespeed.jm.434JizBK7W.js:4Blockly.terminateDrag_ @ 

vendor.js.pagespeed.jm.434JizBK7W.js:4Blockly.BlockSvg.onMouseUp_ @ 

vendor.js.pagespeed.jm.434JizBK7W.js:4g @ vendor.js.pagespeed.jm.434JizBK7W.js:4

vendor.js.pagespeed.jm.434JizBK7W.js:4 Uncaught TypeError: Cannot read property 'sourceBlock_' of null

Steps to reproduce

Go to the Scratch VM (I used this website to do it)
Go to More Blocks
Drag the custom reporter on already existing blocks (the one with the report[] included)
Look at JS console

or use this XML (oh no! The XML adds custom blocks I did not add )

<xml xmlns="http://www.w3.org/1999/xhtml">
  <block type="procedures_defreturn" id="|v5?DM}fOQDHxb]yAWN0" x="132" y="115">
    <field name="NAME">do something</field>
  </block>
  <block type="event_whenflagclicked" id="kO-UNwe9NlxZc@BlO.+u" x="148" y="115"></block>
  <block type="procedures_defreturn" id="xUE}[p?`iSSv;y`TO%G," x="133" y="159">
    <field name="NAME">do something2</field>
  </block>
  <block type="looks_seteffectto" id="`{CFzSvO-Sp8vv%oe0oq" x="148" y="163">
    <value name="EFFECT">
      <shadow type="looks_effectmenu" id="*dVu+)?CMSV-7y@Fx9m,">
        <field name="EFFECT">brightness</field>
      </shadow>
    </value>
    <value name="VALUE">
      <shadow type="math_number" id="h[ERc4qLNz6mmhVGWhNA">
        <field name="NUM">-40</field>
      </shadow>
    </value>
    <next>
      <block type="control_forever" id="Orem,2~_?cdhrNs_V0b+">
        <statement name="SUBSTACK">
          <block type="looks_changeeffectby" id="!E4H6wj)p=s2B1F#:y@a">
            <value name="EFFECT">
              <shadow type="looks_effectmenu" id="U;xfv[sZY8yzS{%0Ceay">
                <field name="EFFECT">color</field>
              </shadow>
            </value>
            <value name="CHANGE">
              <shadow type="math_number" id="q/(B#g(Nkoh`m;ycBpn#">
                <field name="NUM">1</field>
              </shadow>
            </value>
          </block>
        </statement>
      </block>
    </next>
  </block>
  <block type="procedures_callnoreturn" id="`qY9DxfNl0LK);AgMP!/" x="216" y="485">
    <mutation name="do something"></mutation>
  </block>
  <block type="procedures_defnoreturn" id="s(3z`I~G@zezR2-MF!LU" x="117" y="523">
    <field name="NAME">do something</field>
  </block>
</xml>