diff --git a/src/asammdf/blocks/utils.py b/src/asammdf/blocks/utils.py
index 22dca197e..10a41cb48 100644
--- a/src/asammdf/blocks/utils.py
+++ b/src/asammdf/blocks/utils.py
@@ -2123,15 +2123,21 @@ def parse_channels(display, conversions):
             elif elem.tag == "CHANNEL_PATTERN":
                 try:
                     filter_type = elem.get("filter_type")
-                    if filter_type == "None":
+                    if filter_type in ("None", None):
                         filter_type = "Unspecified"
+                        filter_value = 0
+                        raw = False
+                    else:
+                        filter_value = float(elem.get("filter_value"))
+                        raw = bool(int(elem.get("filter_use_raw")))
+
                     info = {
                         "pattern": elem.get("name_pattern"),
                         "name": elem.get("name_pattern"),
                         "match_type": "Wildcard",
                         "filter_type": filter_type,
-                        "filter_value": float(elem.get("filter_value")),
-                        "raw": bool(int(elem.get("filter_use_raw"))),
+                        "filter_value": filter_value,
+                        "raw": raw,
                     }
 
                     multi_color = elem.find("MULTI_COLOR")
diff --git a/src/asammdf/gui/widgets/plot.py b/src/asammdf/gui/widgets/plot.py
index 154502e67..ad8f35775 100644
--- a/src/asammdf/gui/widgets/plot.py
+++ b/src/asammdf/gui/widgets/plot.py
@@ -5430,6 +5430,7 @@ def range_modified_handler(self, region):
     def scale_curve_to_pixmap(self, x, y, y_range, x_start, delta):
         if self.py:
             y_low, y_high = y_range
+
             y_scale = (np.float64(y_high) - np.float64(y_low)) / np.float64(self.py)
             x_scale = self.px