Between Thursday and Friday, June 1, 2026, the Sui Crypto Community stopped processing transactions not as soon as, not twice, however 3 times in below 48 hours, the results of a software program bug launched in a latest protocol improve.
SUI fell roughly -8% intraday in the course of the disruption, sliding from round $0.99 to $0.87, as merchants reacted to what regarded, on the floor, like a community in deep trouble.
Right here is the central rigidity this text unpacks: three halts in two days sounds catastrophic, however does it imply your SUI is in danger, and what does it say a few blockchain that payments itself as one of many quickest Layer 1 networks in crypto?
Sui Improve Bug: What Truly Prompted the Sui Community Halts
Consider a blockchain’s validators like a panel of judges who should all agree on each resolution earlier than the subsequent case proceeds. If one choose will get handed paperwork that doesn’t make sense, numbers that don’t add up – the entire courtroom freezes fairly than threat making a incorrect ruling.
That’s basically what occurred right here, and it occurred three separate instances.
The SUI outage chain started with protocol model v1.72, which launched two new options: an “deal with balances” accounting mannequin and gasless stablecoin switch pathways designed to cut back friction for on a regular basis customers. The issue was a logic bug buried in how these new fee routes interacted with Sui’s gas-charging system.
In sure transactions, the community would cancel a fee for inadequate funds, however nonetheless mark these funds as spent, making a destructive stability that validators couldn’t reconcile. The community halted fairly than file one thing contradictory, per the Sui Basis’s postmortem.
Following final week’s outages associated to the 1.72 launch, the Sui Core Workforce has accomplished an investigation and incident evaluate, detailing what occurred and the steps taken by validators to restart the community.
— Sui (@SuiNetwork) Might 31, 2026
The primary Mainnet halt ran from roughly 7:00 a.m. to 1:30 p.m. PT on Thursday. Builders deployed an emergency patch to revive the chain – however explicitly acknowledged it carried a recognized chance of inflicting one other halt.
That’s a big admission: they knowingly shipped a repair that may break issues once more, selecting pace over certainty to get the community again on-line. Certain sufficient, a variant of the identical gas-fee bug triggered a second blockchain downtime occasion on Friday morning.
The third outage had a definite trigger fully. When validators rebooted to use the Friday repair, a randomness mechanism utilized by sure on-chain functions didn’t correctly file its deactivation standing. The protocol deadlocked, unable to shut the present epoch, and the chain froze once more from roughly 1:30 p.m. to 7:20 p.m. PT Friday. Three separate failure factors, all triggered by a single Sui improve bug in v1.72.
Is Your SUI Crypto Protected? What Holders Have to Know Proper Now
The reply is determined by the place your SUI was sitting and what you have been doing with it in the course of the outages.
The crucial distinction is between a liveness failure and a security failure. This was a liveness failure. The community stopped shifting ahead. It didn’t alter, erase, or expose any present balances or non-public keys.
Sui Basis explains causes of three consecutive mainnet halts
Sui Basis mentioned three mainnet halts on Thursday and Friday have been attributable to two separate bugs launched within the v1.72 improve. The primary two halts have been tied to a gas-charging bug uncovered by the “deal with… pic.twitter.com/7wfhVbUKge
— Wu Blockchain (@WuBlockchain) June 1, 2026
In case your SUI was on an trade, your funds weren’t in danger. Exchanges sometimes droop deposits and withdrawals throughout community disruptions, which is normal follow. You would not transfer your SUI in the course of the outage home windows however your stability remained intact.
In case your SUI was in a self-custody pockets, your belongings have been secure all through. A community halt doesn’t contact the ledger state. Your tokens existed on-chain precisely as they did earlier than the freeze. Nobody can entry your funds with out your non-public keys and the halt had no bearing on key safety.
In the event you had a pending transaction or an open DeFi place in the course of the halt, that is the place actual frustration occurred. Leveraged positions couldn’t be managed. Time-sensitive trades couldn’t be executed. Transactions submitted in the course of the outage home windows have been both delayed or failed outright.
You didn’t lose funds to the bug itself, however market strikes throughout downtime have been fully outdoors anybody’s management. That may be a real and legit threat for energetic DeFi customers on Sui.
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