diff --git a/app/src/screen.c b/app/src/screen.c
index 55a06ab3..dc61e835 100644
--- a/app/src/screen.c
+++ b/app/src/screen.c
@@ -299,6 +299,12 @@ sc_screen_frame_sink_open(struct sc_frame_sink *sink,
 
     struct sc_screen *screen = DOWNCAST(sink);
 
+    if (ctx->width <= 0 || ctx->width > 0xFFFF
+            || ctx->height <= 0 || ctx->height > 0xFFFF) {
+        LOGE("Invalid video size: %dx%d", ctx->width, ctx->height);
+        return false;
+    }
+
     assert(ctx->width > 0 && ctx->width <= 0xFFFF);
     assert(ctx->height > 0 && ctx->height <= 0xFFFF);
     // screen->frame_size is never used before the event is pushed, and the
diff --git a/server/src/main/java/com/genymobile/scrcpy/Options.java b/server/src/main/java/com/genymobile/scrcpy/Options.java
index 2f86d8ce..d07828eb 100644
--- a/server/src/main/java/com/genymobile/scrcpy/Options.java
+++ b/server/src/main/java/com/genymobile/scrcpy/Options.java
@@ -456,8 +456,14 @@ public class Options {
         }
         int width = Integer.parseInt(tokens[0]);
         int height = Integer.parseInt(tokens[1]);
+        if (width <= 0 || height <= 0) {
+            throw new IllegalArgumentException("Invalid crop size: " + width + "x" + height);
+        }
         int x = Integer.parseInt(tokens[2]);
         int y = Integer.parseInt(tokens[3]);
+        if (x < 0 || y < 0) {
+            throw new IllegalArgumentException("Invalid crop offset: " + x + ":" + y);
+        }
         return new Rect(x, y, x + width, y + height);
     }