diff --git a/src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java b/src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java
index 97ba11bf7..43c0035cf 100644
--- a/src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java
+++ b/src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java
@@ -59,6 +59,7 @@ import org.strongswan.android.security.TrustedCertificateEntry;
 import org.strongswan.android.ui.widget.TextInputLayoutHelper;
 import org.strongswan.android.utils.Constants;
 import org.strongswan.android.utils.IPRangeSet;
+import org.strongswan.android.utils.Utils;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -497,8 +498,8 @@ public class VpnProfileImportActivity extends AppCompatActivity
 			}
 		}
 
-		profile.setIkeProposal(obj.optString("ike-proposal", null));
-		profile.setEspProposal(obj.optString("esp-proposal", null));
+		profile.setIkeProposal(getProposal(obj, "ike-proposal", true));
+		profile.setEspProposal(getProposal(obj, "esp-proposal", false));
 		profile.setMTU(getInteger(obj, "mtu", Constants.MTU_MIN, Constants.MTU_MAX));
 		profile.setNATKeepAlive(getInteger(obj, "nat-keepalive", Constants.NAT_KEEPALIVE_MIN, Constants.NAT_KEEPALIVE_MAX));
 		JSONObject split = obj.optJSONObject("split-tunneling");
@@ -536,6 +537,19 @@ public class VpnProfileImportActivity extends AppCompatActivity
 		return res < min || res > max ? null : res;
 	}
 
+	private String getProposal(JSONObject obj, String key, boolean ike) throws JSONException
+	{
+		String value = obj.optString(key, null);
+		if (!TextUtils.isEmpty(value))
+		{
+			if (!Utils.isProposalValid(ike, value))
+			{
+				throw new JSONException(getString(R.string.profile_import_failed_value, key));
+			}
+		}
+		return value;
+	}
+
 	private String getSubnets(JSONObject split, String key) throws JSONException
 	{
 		ArrayList<String> subnets = new ArrayList<>();