diff --git a/Sources/Earthquake Network/Controllers/Seismic Networks/SeismicNetworksIntensityMapViewController.swift b/Sources/Earthquake Network/Controllers/Seismic Networks/SeismicNetworksIntensityMapViewController.swift
index f134ccb..f13eba9 100644
--- a/Sources/Earthquake Network/Controllers/Seismic Networks/SeismicNetworksIntensityMapViewController.swift	
+++ b/Sources/Earthquake Network/Controllers/Seismic Networks/SeismicNetworksIntensityMapViewController.swift	
@@ -199,7 +199,11 @@ class SeismicNetworksIntensityMapViewController: EQNBaseMapViewController {
         
         let minIntensity = shakemaps.map { $0.intensity }.min() ?? 0
         let maxIntensity = shakemaps.map { $0.intensity }.max() ?? 255
-        let indexColor = Int(round((intensity-minIntensity)/(maxIntensity-minIntensity)*255))
+        let indexColor = if minIntensity == maxIntensity {
+            0
+        } else {
+            Int(round((intensity-minIntensity)/(maxIntensity-minIntensity)*255))
+        }
         
         let lineColor = UIColor(hexString: shakemapColors[indexColor]) ?? .white
         let textColor: UIColor = indexColor < 65 ? .white : .black