diff --git a/src/cryptoconditions/src/cryptoconditions.c b/src/cryptoconditions/src/cryptoconditions.c
index 74949affc..f7acde1aa 100644
--- a/src/cryptoconditions/src/cryptoconditions.c
+++ b/src/cryptoconditions/src/cryptoconditions.c
@@ -117,14 +117,15 @@ uint32_t fromAsnSubtypes(const ConditionTypes_t types) {
 
 size_t cc_conditionBinary(const CC *cond, unsigned char *buf) {
     Condition_t *asn = calloc(1, sizeof(Condition_t));
-    asnCondition(cond, asn);
+    bool r = asnCondition(cond, asn);
+    size_t out = 0;
+    if (!r) goto end;
     asn_enc_rval_t rc = der_encode_to_buffer(&asn_DEF_Condition, asn, buf, 1000);
-    if (rc.encoded == -1) {
-        fprintf(stderr, "CONDITION NOT ENCODED\n");
-        return 0;
-    }
+    if (rc.encoded == -1) goto end;
+    out = rc.encoded;
+end:
     ASN_STRUCT_FREE(asn_DEF_Condition, asn);
-    return rc.encoded;
+    return out;
 }
 
 
@@ -140,17 +141,22 @@ size_t cc_fulfillmentBinary(const CC *cond, unsigned char *buf, size_t length) {
 }
 
 
-void asnCondition(const CC *cond, Condition_t *asn) {
+bool asnCondition(const CC *cond, Condition_t *asn) {
     asn->present = cc_isAnon(cond) ? cond->conditionType->asnType : cond->type->asnType;
     
     // This may look a little weird - we dont have a reference here to the correct
     // union choice for the condition type, so we just assign everything to the threshold
     // type. This works out nicely since the union choices have the same binary interface.
+
     CompoundSha256Condition_t *choice = &asn->choice.thresholdSha256;
     choice->cost = cc_getCost(cond);
     choice->fingerprint.buf = cond->type->fingerprint(cond);
+    if (choice->fingerprint.buf == 0) {
+        return 0;
+    }
     choice->fingerprint.size = 32;
     choice->subtypes = asnSubtypes(cond->type->getSubtypes(cond));
+    return 1;
 }
 
 
diff --git a/src/cryptoconditions/src/internal.h b/src/cryptoconditions/src/internal.h
index 790e28962..e2525cbe4 100644
--- a/src/cryptoconditions/src/internal.h
+++ b/src/cryptoconditions/src/internal.h
@@ -65,7 +65,7 @@ extern int CCTypeRegistryLength;
  */
 uint32_t fromAsnSubtypes(ConditionTypes_t types);
 CC *mkAnon(const Condition_t *asnCond);
-void asnCondition(const CC *cond, Condition_t *asn);
+bool asnCondition(const CC *cond, Condition_t *asn);
 Condition_t *asnConditionNew(const CC *cond);
 Fulfillment_t *asnFulfillmentNew(const CC *cond);
 struct CC *fulfillmentToCC(Fulfillment_t *ffill);
diff --git a/src/cryptoconditions/tests/test_failure_modes.py b/src/cryptoconditions/tests/test_failure_modes.py
index 59b0b3f24..435e20c88 100644
--- a/src/cryptoconditions/tests/test_failure_modes.py
+++ b/src/cryptoconditions/tests/test_failure_modes.py
@@ -82,4 +82,25 @@ def test_malleability_checked():
     assert not cc_rfb(b'\xa2\x13\xa0\x0f\xa0\x06\x80\x04abcd\xa0\x05\x80\x03abc\xa1\x00')
 
 
+def test_large_threshold():
+    conds = [{
+        'type': "secp256k1-sha-256",
+        "publicKey": "02D5D969305535AC29A77079C11D4F0DD40661CF96E04E974A5E8D7E374EE225AA"
+    }]
+
+    for i in range(250):
+        conds.append({
+            "type": "eval-sha-256",
+            "code": "VEVTVAE"
+        })
+
+    r = jsonRPC("encodeCondition", {
+        "type": "threshold-sha-256",
+        "subfulfillments": conds,
+        "threshold": 251
+    })
+    assert 'error' not in r, r
+
+
+
 so.cc_conditionUri.restype = ctypes.c_char_p