diff --git a/util/EGLWindow.cpp b/util/EGLWindow.cpp
index 7e31463a0..21383a5d5 100644
--- a/util/EGLWindow.cpp
+++ b/util/EGLWindow.cpp
@@ -178,8 +178,14 @@ bool EGLWindow::initializeDisplay(OSWindow *osWindow,
     LoadUtilEGL(getProcAddress);
 #endif  // defined(ANGLE_USE_UTIL_LOADER)
 
+    // EGL_NO_DISPLAY + EGL_EXTENSIONS returns NULL before Android 10
     const char *extensionString =
         static_cast<const char *>(eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS));
+    if (!extensionString)
+    {
+        // fallback to an empty string for strstr
+        extensionString = "";
+    }
 
     std::vector<EGLAttrib> displayAttributes;
     displayAttributes.push_back(EGL_PLATFORM_ANGLE_TYPE_ANGLE);
@@ -879,10 +885,11 @@ void EGLWindow::Delete(EGLWindow **window)
 
 void EGLWindow::queryFeatures()
 {
+    // EGL_NO_DISPLAY + EGL_EXTENSIONS returns NULL before Android 10
     const char *extensionString =
         static_cast<const char *>(eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS));
     const bool hasFeatureControlANGLE =
-        strstr(extensionString, "EGL_ANGLE_feature_control") != nullptr;
+        extensionString && strstr(extensionString, "EGL_ANGLE_feature_control") != nullptr;
 
     if (!hasFeatureControlANGLE)
     {