diff --git a/brian2tools/mdexport/expander.py b/brian2tools/mdexport/expander.py
index 75085d43..500ae746 100644
--- a/brian2tools/mdexport/expander.py
+++ b/brian2tools/mdexport/expander.py
@@ -704,8 +704,9 @@ def expand_initializer(self, initializer):
                 (initializer['index'] != 'True' and initializer['index'] != 'False')):
             init_str += ' if ' + self.render_expression(initializer['index'])
         elif (isinstance(initializer['index'], bool) or
-            (initializer['index'] == 'True' or
-             initializer['index'] == 'False')):
+            (isinstance(initializer['index'], str) and
+             (initializer['index'] == 'True' or
+              initializer['index'] == 'False'))):
             if initializer['index'] is True or initializer['index'] == 'True':
                 init_str += ''  # "to all members" implied
             else:
@@ -796,10 +797,10 @@ def expand_connector(self, connector):
                         self.expand_identifiers(connector['identifiers']))
         return con_str + '.' + endll
 
-    
-       
 
-  
+
+
+
     def expand_pathway(self, pathway):
         """
         Expand `SynapticPathway`
@@ -864,7 +865,7 @@ def expand_summed_variables(self, sum_variables):
             sum_var_str += self.expand_summed_variable(sum_var)
         return sum_var_str
 
-   
+
 
     def expand_runregularly(self, run_reg):
         """
@@ -880,4 +881,4 @@ def expand_runregularly(self, run_reg):
                 ' code: ' +
                 self.prepare_math_statements(run_reg['code'], separate=True) +
                 ' will be executed' + endll)
-        return md_str
+        return md_str
\ No newline at end of file
diff --git a/brian2tools/plotting/morphology.py b/brian2tools/plotting/morphology.py
index 4cf6b5c9..3bba0bab 100644
--- a/brian2tools/plotting/morphology.py
+++ b/brian2tools/plotting/morphology.py
@@ -34,15 +34,15 @@ def _plot_morphology2D(morpho, axes, colors,
         color = colors[color_counter % len(colors)]
 
     if isinstance(morpho, Soma):
-        x, y = morpho.x/um, morpho.y/um
-        radius = morpho.diameter/um/2
+        x, y = float(morpho.x[0]/um), float(morpho.y[0]/um)
+        radius = float(morpho.diameter[0]/um/2)
         circle = Circle((x, y), radius=radius, color=color)
         axes.add_patch(circle)
-       
-      
+
+
     else:
         coords = morpho.coordinates/um
-    
+
         if show_diameter:
             coords_2d = coords[:, :2]
             directions = np.diff(coords_2d, axis=0)
@@ -56,7 +56,7 @@ def _plot_morphology2D(morpho, axes, colors,
                                 (coords_2d - orthogonal*radius[:, np.newaxis])[::-1]])
             patch = Polygon(points, color=color)
             axes.add_patch(patch)
-           
+
         else:
             axes.plot(coords[:, 0], coords[:, 1], color=color, lw=2)
         if show_compartments:
@@ -74,7 +74,7 @@ def _plot_morphology2D(morpho, axes, colors,
                            show_compartments=show_compartments,
                            show_diameter=show_diameter,
                            colors=colors, color_counter=color_counter+1)
-    
+
 def _plot_morphology3D(morpho, figure, colors, values, value_norm,
                        value_colormap,
                        show_diameters=True,
@@ -439,4 +439,4 @@ def plot_dendrogram(morphology, axes=None):
     axes.set_xticks([])
     axes.set_ylabel('distance from root (um)')
     axes.set_xlim(-1, terminal_counter)
-    return axes
+    return axes
\ No newline at end of file
diff --git a/brian2tools/tests/test_baseexport.py b/brian2tools/tests/test_baseexport.py
index bc958e75..c0c73598 100644
--- a/brian2tools/tests/test_baseexport.py
+++ b/brian2tools/tests/test_baseexport.py
@@ -4,6 +4,7 @@
                     PopulationRateMonitor, EventMonitor, set_device,
                     run, device, Network, Synapses, PoissonInput, TimedArray,
                     Function)
+from brian2.core.base import BrianObject
 from brian2.core.namespace import get_local_namespace
 from brian2.equations.equations import (DIFFERENTIAL_EQUATION,
                                         FLOAT, SUBEXPRESSION,
@@ -236,7 +237,7 @@ def test_spikegenerator():
     assert spike_gen_dict['indices'] == [0]
     assert spike_gen_dict['indices'].dtype == int
 
-    assert float(spike_gen_dict['times']) == float(time)
+    assert float(spike_gen_dict['times'][0]) == float(time[0])
     assert spike_gen_dict['times'][:].dimensions == second
     assert spike_gen_dict['times'].dtype == float
 
@@ -898,14 +899,16 @@ def test_ExportDevice_unsupported():
     """
     start_scope()
     set_device('exporter')
-    eqn = '''
-    v = 1 :1
-    g :1
-    '''
-    G = NeuronGroup(1, eqn)
-    _ = PoissonInput(G, 'g', 1, 1 * Hz, 1)
-    # with pytest.raises(NotImplementedError):
-    run(10 * ms)
+
+    class UnsupportedObject(BrianObject):
+        def __init__(self):
+            super().__init__(name='unsupported*')
+
+    obj = UnsupportedObject()
+    net = Network(obj)
+    with pytest.raises(NotImplementedError):
+        net.run(10 * ms)
+    device.reinit()
 
 
 if __name__ == '__main__':
@@ -926,8 +929,8 @@ def test_ExportDevice_unsupported():
     test_Synapses()
     test_ExportDevice_options()
     test_ExportDevice_basic()
-    test_ExportDevice_unsupported()  # TODO: not checking anything
+    test_ExportDevice_unsupported()
     test_synapse_init()
     test_synapse_connect_cond()
     test_synapse_connect_generator()
-    test_synapse_connect_ij()
+    test_synapse_connect_ij()
\ No newline at end of file