diff --git a/news/runtimewarning.rst b/news/runtimewarning.rst
new file mode 100644
index 0000000..b100f90
--- /dev/null
+++ b/news/runtimewarning.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Resolved `RuntimeWarning` through condition to handle arrays containing only NaN values
+
+**Security:**
+
+* <news item>
diff --git a/src/diffpy/fourigui/fourigui.py b/src/diffpy/fourigui/fourigui.py
index f331b7e..0034490 100755
--- a/src/diffpy/fourigui/fourigui.py
+++ b/src/diffpy/fourigui/fourigui.py
@@ -371,8 +371,12 @@ def intensity_upd_local(self):
         elif self.axis.get() == 2:
             plane = self.cube[:, :, self.plane_num.get()]
         nan_ratio = np.count_nonzero(np.isnan(plane)) / plane.size
-        self.localmax["text"] = "{}".format(np.format_float_scientific(np.nanmax(plane), 1))
-        self.localmin["text"] = "{}".format(np.format_float_scientific(np.nanmin(plane), 1))
+        if np.isnan(plane).all():
+            self.localmax["text"] = "NaN"
+            self.localmin["text"] = "NaN"
+        else:
+            self.localmax["text"] = "{}".format(np.format_float_scientific(np.nanmax(plane), 1))
+            self.localmin["text"] = "{}".format(np.format_float_scientific(np.nanmin(plane), 1))
         self.localsum["text"] = "{}".format(np.format_float_scientific(np.nansum(plane), 1))
         self.localnanratio["text"] = "{}".format(round(nan_ratio, 2))