diff --git a/CHANGES.rst b/CHANGES.rst
index abcf1861..0cf9a7a8 100755
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -11,6 +11,7 @@
 - Watershed tool: 2D flowlines intersecting obstacles are no longer shown as 1D flowlines (#1034)
 - Model selection dialog: fixed order bug when sorting.
 - Bump threedi-mi-utils to 0.1.4
+- Fixed attribute error when selecting substance in a model that contains pumps (#1044)
 
 
 3.9.3 (2024-08-14)
diff --git a/tool_graph/graph_model.py b/tool_graph/graph_model.py
index 3113b4fc..2a6ae876 100644
--- a/tool_graph/graph_model.py
+++ b/tool_graph/graph_model.py
@@ -1,15 +1,17 @@
 from collections import OrderedDict
+from qgis.PyQt.QtCore import Qt
+from qgis.PyQt.QtGui import QColor
 from random import randint
 from threedi_results_analysis.models.base import BaseModel
-from threedi_results_analysis.models.base_fields import CheckboxField, CHECKBOX_FIELD
+from threedi_results_analysis.models.base_fields import CHECKBOX_FIELD
+from threedi_results_analysis.models.base_fields import CheckboxField
 from threedi_results_analysis.models.base_fields import ValueField
+from threedi_results_analysis.utils.color import COLOR_LIST
 
 import logging
 import numpy as np
 import pyqtgraph as pg
-from qgis.PyQt.QtCore import Qt
-from qgis.PyQt.QtGui import QColor
-from threedi_results_analysis.utils.color import COLOR_LIST
+
 
 logger = logging.getLogger(__name__)
 
@@ -149,7 +151,13 @@ def timeseries_table(self, parameters, absolute, time_units):
 
             ga = threedi_result.get_gridadmin(parameters)
             if ga.has_pumpstations:
-                pump_fields = set(list(ga.pumps.Meta.composite_fields.keys()))
+                # In some gridadmin types pumps do not have a Meta attribute... In
+                # such cases (e.g. water quality) the attribute does not have a meaning and
+                # the timeserie should be empty.
+                try:
+                    pump_fields = set(list(ga.pumps.Meta.composite_fields.keys()))
+                except AttributeError:
+                    pump_fields = {}
             else:
                 pump_fields = {}
             if self.object_type.value == "pump_linestring" and parameters not in pump_fields: