diff --git a/app/src/main/java/com/hippo/text/Html.java b/app/src/main/java/com/hippo/text/Html.java
index 76924ba4f..b8c7ff7a8 100644
--- a/app/src/main/java/com/hippo/text/Html.java
+++ b/app/src/main/java/com/hippo/text/Html.java
@@ -713,11 +713,13 @@ class HtmlToSpannedConverter implements ContentHandler {
                             where, len,
                             Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                 } else {
-                    int c = getHtmlColor(f.mColor);
-                    if (c != -1) {
+                    try {
+                        int c = getHtmlColor(f.mColor);
                         text.setSpan(new ForegroundColorSpan(c | 0xFF000000),
                                 where, len,
                                 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+                    } catch (IllegalArgumentException e) {
+                        // Ignore
                     }
                 }
             }
@@ -906,16 +908,19 @@ class HtmlToSpannedConverter implements ContentHandler {
      */
     @ColorInt
     public static int getHtmlColor(@NonNull String colorString) {
-        if (colorString.charAt(0) == '#') {
+        if ((colorString.length() == 7 || colorString.length() == 9) && colorString.charAt(0) == '#') {
             // Use a long to avoid rollovers on #ffXXXXXX
-            long color = Long.parseLong(colorString.substring(1), 16);
+            long color;
+            try {
+                color = Long.parseLong(colorString.substring(1), 16);
+            } catch (NumberFormatException e) {
+                throw new IllegalArgumentException("Unknown color: " + colorString);
+            }
             if (colorString.length() == 7) {
                 // Set the alpha value
                 color |= 0x00000000ff000000;
-            } else if (colorString.length() != 9) {
-                throw new IllegalArgumentException("Unknown color: " + colorString);
             }
-            return (int)color;
+            return (int) color;
         } else if (colorString.startsWith("rgb(") && colorString.endsWith(")")) {
             String str = colorString.substring(4, colorString.length() - 1);
             String[] colors = str.split("[\\s]*,[\\s]*");