exception after updating from 7.1.0 to 7.1.2

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Hi,
We recently made an update of GigaSpaces version without touching the code in classes related to the following exception we get now:

java.lang.IllegalArgumentException: Using EXCLUSIVEREADLOCK modifier without a transaction is illegal.
at com.gigaspaces.internal.client.spaceproxy.actions.AbstractSpaceProxyActionManager.readById(AbstractSpaceProxyActionManager.java:174)
        at com.gigaspaces.internal.client.spaceproxy.AbstractSpaceProxy.readById(AbstractSpaceProxy.java:198)
        at com.gigaspaces.internal.client.dcache.AbstractSpaceCache.readById(AbstractSpaceCache.java:620)
at com.mypackage.MyClass.myMethod(...)

We get this at the line:
cachedSpace.readById(AClass.class.getName(), value, value, null, JavaSpace.NOWAIT, TransactionDefinition.ISOLATIONDEFAULT, false, null);
where:
cachedSpace = (ISpaceProxy) new LocalCacheSpaceConfigurer(gigaSpace.getClustered().getSpace()).updateMode(LocalCacheSpaceConfigurer.UpdateMode.PULL).localCache();
where:
@GigaSpaceContext(name = "gigaSpace")
public static GigaSpace gigaSpace;
and
<os-core:space id="space" url="/./appSpace?NOWriteLease=true">
        <os-core:properties>
            <props>
                <prop key="space-config.leasemanager.expirationtime_interval">1000</prop>
                <prop key="space-config.engine.cache_policy">1</prop>
            </props>
        </os-core:properties>
</os-core:space>
<os-core:local-tx-manager id="transactionManager" space="space">
        <os-core:renew pool-size="2" duration="1000" round-trip-time="500" />
</os-core:local-tx-manager>
<os-core:giga-space id="gigaSpace" space="space" tx-manager="transactionManager"/>

Is there something we are doing wrong? I didn't intend to use a transaction with the cached space, just the optimistic locking.
The most strange is we didn't see this before updating to 7.1.2

Thanks,
Lucian

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