diff --git a/contracts/vault/proptest-regressions/fuzz_math.txt b/contracts/vault/proptest-regressions/fuzz_math.txt
index 57c519eb..293ada94 100644
--- a/contracts/vault/proptest-regressions/fuzz_math.txt
+++ b/contracts/vault/proptest-regressions/fuzz_math.txt
@@ -5,3 +5,4 @@
 # It is recommended to check this file in to source control so that
 # everyone who runs the test benefits from these saved cases.
 cc 5fb6e9c997750435f990105f21d40fa1e16d428d3130a6b68acf02703a302c11 # shrinks to deposit_amount = 1
+cc 76bcf8ca3dcb1b07962c6d984fe8ba32d6fe23c613492f646a7b084a726e9656 # shrinks to deposit_amount = 6384692
diff --git a/contracts/vault/src/test.rs b/contracts/vault/src/test.rs
index 2a2dc6be..6452cc57 100644
--- a/contracts/vault/src/test.rs
+++ b/contracts/vault/src/test.rs
@@ -408,6 +408,47 @@ fn test_accrue_yield_increases_total_assets() {
 
 // ─── 5. report_benji_yield ───────────────────────────────────────────────────
 
+#[test]
+fn test_accrue_yield_rejects_zero_amount() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let (vault, _, _, _) = setup_vault(&env);
+
+    let result = vault.try_accrue_yield(&0);
+    assert!(matches!(result, Err(Ok(VaultError::InvalidAmount))));
+}
+
+#[test]
+fn test_accrue_yield_fee_math_overflow_reverts_before_transfer() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let (vault, usdc, _, admin) = setup_vault(&env);
+    vault.set_fee_bps(&10_000);
+
+    let result = vault.try_accrue_yield(&i128::MAX);
+    assert!(matches!(result, Err(Ok(VaultError::MathOverflow))));
+    assert_eq!(usdc.balance(&admin), 0);
+    assert_eq!(vault.total_assets(), 0);
+    assert_eq!(vault.treasury_balance(), 0);
+}
+
+#[test]
+fn test_accrue_yield_full_fee_accumulates_to_treasury_only() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let (vault, _, usdc_sa, admin) = setup_vault(&env);
+    usdc_sa.mint(&admin, &250);
+
+    vault.set_fee_bps(&10_000);
+    vault.accrue_yield(&250);
+
+    assert_eq!(vault.total_assets(), 0);
+    assert_eq!(vault.treasury_balance(), 250);
+}
+
 #[test]
 #[should_panic]
 fn test_report_benji_yield_wrong_strategy_panics() {