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When I open a QGIS project created on Windows QGIS installation (see attachment), it crashes QGIS on Linux.

I found out that the reason for that crash is in QGIS project Coordinate system definition in *.qgs file. When there is custom coordinate system definition that uses NTV2 grid file for datum transformation, it crashes QGIS (see line 28 in qgs file from attachment. Probably because that file (D:\\HRNTv2.gsb) does not exit on Linux OS.
For example, if you open a QGIS project file from the attachment, you will find something like this:

<!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
<qgis projectname="" version="2.18.3">
<title></title>
<autotransaction active="0"/>
<evaluateDefaultValues active="0"/>
<layer-tree-group expanded="1" checked="Qt::Checked" name="">
<customproperties/>
<layer-tree-layer expanded="1" checked="Qt::Checked" id="Novigrad_2008_upu_stancijeta_1_point20170410131027696" name="Novigrad_2008_upu_stancijeta_1_point">
<customproperties/>
</layer-tree-layer>
<layer-tree-layer expanded="1" checked="Qt::Checked" id="Novigrad_2008_upu_stancijeta_1_polygon20170410130908229" name="Novigrad_2008_upu_stancijeta_1_polygon">
<customproperties/>
</layer-tree-layer>
</layer-tree-group>
<relations/>
<mapcanvas>
<units>meters</units>
<extent>
<xmin>5388731.26843392010778189</xmin>
<ymin>5021504.89625283982604742</ymin>
<xmax>5389744.13858615513890982</xmax>
<ymax>5022828.19216307904571295</ymax>
</extent>
<rotation>0</rotation>
<projections>1</projections>
<destinationsrs>
<spatialrefsys>
<proj4>+proj=tmerc +k=0.9999 +lon_0=15 +no_defs +x_0=5500000 +ellps=bessel +nadgrids=D:\\HRNTv2.gsb +units=m +lat_0=0 +wktext +y_0=0</proj4>
<srsid>100000</srsid>
<srid>0</srid>
<authid>USER:100000</authid>
<description>5 zona</description>
<projectionacronym>tmerc</projectionacronym>
<ellipsoidacronym>bessel</ellipsoidacronym>
<geographicflag>false</geographicflag>
</spatialrefsys>
</destinationsrs>

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Problem is in the bold text. When I delete that line from .qgs file, it works without any problem. I believe that QGIS crashes because he can not find file D:\\HRNTv2.gsb on my Linux machine. I have that file somewhere else on my computer.

• unzip attachment
• open Novigrad_2008_upu_stancijeta_1.qgs file
• and crash

Thank you for your help and best regards,
Mario